18400901924 has 12 divisors (see below), whose sum is σ = 32339784204. Its totient is φ = 9160963584.

The previous prime is 18400901917. The next prime is 18400901933. The reversal of 18400901924 is 42910900481.

It can be written as a sum of positive squares in 2 ways, for example, as 7508222500 + 10892679424 = 86650^2 + 104368^2 .

It is a super-3 number, since 3×18400901924³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9870797 + ... + 9872660.

It is an arithmetic number, because the mean of its divisors is an integer number (2694982017).

Almost surely, 2^18400901924 is an apocalyptic number.

It is an amenable number.

18400901924 is a deficient number, since it is larger than the sum of its proper divisors (13938882280).

18400901924 is a wasteful number, since it uses less digits than its factorization.

18400901924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19743694 (or 19743692 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 18400901924 in words is "eighteen billion, four hundred million, nine hundred one thousand, nine hundred twenty-four".