18378402252 has 24 divisors (see below), whose sum is σ = 49009072896. Its totient is φ = 5250972048.

The previous prime is 18378402199. The next prime is 18378402253. The reversal of 18378402252 is 25220487381.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18378402253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109395168 + ... + 109395335.

It is an arithmetic number, because the mean of its divisors is an integer number (2042044704).

Almost surely, 2^18378402252 is an apocalyptic number.

18378402252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18378402252 is an abundant number, since it is smaller than the sum of its proper divisors (30630670644).

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

18378402252 is a wasteful number, since it uses less digits than its factorization.

18378402252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218790517 (or 218790515 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 18378402252 in words is "eighteen billion, three hundred seventy-eight million, four hundred two thousand, two hundred fifty-two".