18398039976 has 160 divisors (see below), whose sum is σ = 52184110440. Its totient is φ = 6055575552.

The previous prime is 18398039971. The next prime is 18398039981. The reversal of 18398039976 is 67993089381.

It is an interprime number because it is at equal distance from previous prime (18398039971) and next prime (18398039981).

It can be written as a sum of positive squares in 4 ways, for example, as 6900624900 + 11497415076 = 83070^2 + 107226^2 .

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18398039971) 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 39 ways as a sum of consecutive naturals, for example, 19634580 + ... + 19635516.

Almost surely, 2^18398039976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18398039976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26092055220).

18398039976 is an abundant number, since it is smaller than the sum of its proper divisors (33786070464).

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

18398039976 is a wasteful number, since it uses less digits than its factorization.

18398039976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 18398039976 in words is "eighteen billion, three hundred ninety-eight million, thirty-nine thousand, nine hundred seventy-six".