1351999998 has 48 divisors (see below), whose sum is σ = 3066336000. Its totient is φ = 446437656.

The previous prime is 1351999997. The next prime is 1352000011. The reversal of 1351999998 is 8999991531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351999997) 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 23 ways as a sum of consecutive naturals, for example, 39003 + ... + 65001.

It is an arithmetic number, because the mean of its divisors is an integer number (63882000).

Almost surely, 2^1351999998 is an apocalyptic number.

1351999998 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 1351999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1533168000).

1351999998 is an abundant number, since it is smaller than the sum of its proper divisors (1714336002).

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

1351999998 is a wasteful number, since it uses less digits than its factorization.

1351999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26123 (or 26111 counting only the distinct ones).

The product of its digits is 7085880, while the sum is 63.

The square root of 1351999998 is about 36769.5525945041. The cubic root of 1351999998 is about 1105.7549621905.

The spelling of 1351999998 in words is "one billion, three hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".