18039657944 has 32 divisors (see below), whose sum is σ = 42170630400. Its totient is φ = 7028437920.

The previous prime is 18039657931. The next prime is 18039657949. The reversal of 18039657944 is 44975693081.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 18039657944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039657949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14641964 + ... + 14643195.

It is an arithmetic number, because the mean of its divisors is an integer number (1317832200).

Almost surely, 2^18039657944 is an apocalyptic number.

18039657944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18039657944 is an abundant number, since it is smaller than the sum of its proper divisors (24130972456).

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

18039657944 is a wasteful number, since it uses less digits than its factorization.

18039657944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29285183 (or 29285179 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 18039657944 in words is "eighteen billion, thirty-nine million, six hundred fifty-seven thousand, nine hundred forty-four".