18390390722 has 32 divisors (see below), whose sum is σ = 30395179584. Its totient is φ = 8275737600.

The previous prime is 18390390721. The next prime is 18390390737. The reversal of 18390390722 is 22709309381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18390390721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1240538 + ... + 1255274.

It is an arithmetic number, because the mean of its divisors is an integer number (949849362).

Almost surely, 2^18390390722 is an apocalyptic number.

18390390722 is a deficient number, since it is larger than the sum of its proper divisors (12004788862).

18390390722 is a wasteful number, since it uses less digits than its factorization.

18390390722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15314.

The product of its (nonzero) digits is 163296, while the sum is 44.

It can be divided in two parts, 183903 and 90722, that added together give a cube (274625 = 65³).

The spelling of 18390390722 in words is "eighteen billion, three hundred ninety million, three hundred ninety thousand, seven hundred twenty-two".