18439478937 has 48 divisors (see below), whose sum is σ = 29398457088. Its totient is φ = 11044131840.

The previous prime is 18439478921. The next prime is 18439478983. The reversal of 18439478937 is 73987493481.

It is not a de Polignac number, because 18439478937 - 2⁴ = 18439478921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18439478917) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11647648 + ... + 11649230.

It is an arithmetic number, because the mean of its divisors is an integer number (612467856).

Almost surely, 2^18439478937 is an apocalyptic number.

It is an amenable number.

18439478937 is a deficient number, since it is larger than the sum of its proper divisors (10958978151).

18439478937 is a wasteful number, since it uses less digits than its factorization.

18439478937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910 (or 2907 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 18439478937 in words is "eighteen billion, four hundred thirty-nine million, four hundred seventy-eight thousand, nine hundred thirty-seven".