1659898440 has 128 divisors (see below), whose sum is σ = 5682672000. Its totient is φ = 430665984.

The previous prime is 1659898423. The next prime is 1659898453. The reversal of 1659898440 is 448989561.

1659898440 is a `hidden beast` number, since 1 + 6 + 598 + 9 + 8 + 4 + 40 = 666.

It is a super-2 number, since 2×1659898440² = 5510525662228867200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19191 + ... + 60729.

It is an arithmetic number, because the mean of its divisors is an integer number (44395875).

Almost surely, 2^1659898440 is an apocalyptic number.

1659898440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659898440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2841336000).

1659898440 is an abundant number, since it is smaller than the sum of its proper divisors (4022773560).

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

1659898440 is a wasteful number, since it uses less digits than its factorization.

1659898440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41596 (or 41586 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 1659898440 is about 40741.8512097818. The cubic root of 1659898440 is about 1184.0240000766.

The spelling of 1659898440 in words is "one billion, six hundred fifty-nine million, eight hundred ninety-eight thousand, four hundred forty".