17904638442 has 64 divisors (see below), whose sum is σ = 39498624000. Its totient is φ = 5385968640.

The previous prime is 17904638441. The next prime is 17904638449. The reversal of 17904638442 is 24483640971.

It is a junction number, because it is equal to n+sod(n) for n = 17904638391 and 17904638400.

It is not an unprimeable number, because it can be changed into a prime (17904638441) 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 31 ways as a sum of consecutive naturals, for example, 318684 + ... + 370632.

It is an arithmetic number, because the mean of its divisors is an integer number (617166000).

Almost surely, 2^17904638442 is an apocalyptic number.

17904638442 is an abundant number, since it is smaller than the sum of its proper divisors (21593985558).

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

17904638442 is a wasteful number, since it uses less digits than its factorization.

17904638442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52111.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 17904638442 in words is "seventeen billion, nine hundred four million, six hundred thirty-eight thousand, four hundred forty-two".