18735721404 has 24 divisors (see below), whose sum is σ = 43835812608. Its totient is φ = 6228222000.

The previous prime is 18735721397. The next prime is 18735721421. The reversal of 18735721404 is 40412753781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2122722 + ... + 2131529.

It is an arithmetic number, because the mean of its divisors is an integer number (1826492192).

Almost surely, 2^18735721404 is an apocalyptic number.

It is an amenable number.

18735721404 is an abundant number, since it is smaller than the sum of its proper divisors (25100091204).

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

18735721404 is a wasteful number, since it uses less digits than its factorization.

18735721404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254625 (or 4254623 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 18735721404 in words is "eighteen billion, seven hundred thirty-five million, seven hundred twenty-one thousand, four hundred four".