1646129898 has 64 divisors (see below), whose sum is σ = 4196448000. Its totient is φ = 468545472.

The previous prime is 1646129897. The next prime is 1646129899. The reversal of 1646129898 is 8989216461.

1646129898 is a `hidden beast` number, since 1 + 6 + 461 + 2 + 98 + 98 = 666.

It is an interprime number because it is at equal distance from previous prime (1646129897) and next prime (1646129899).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1646129897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93588 + ... + 109776.

It is an arithmetic number, because the mean of its divisors is an integer number (65569500).

Almost surely, 2^1646129898 is an apocalyptic number.

1646129898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646129898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2098224000).

1646129898 is an abundant number, since it is smaller than the sum of its proper divisors (2550318102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1646129898 is a wasteful number, since it uses less digits than its factorization.

1646129898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16476 (or 16470 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 1646129898 is about 40572.5263941007. The cubic root of 1646129898 is about 1180.7411550877.

The spelling of 1646129898 in words is "one billion, six hundred forty-six million, one hundred twenty-nine thousand, eight hundred ninety-eight".