18916038 has 32 divisors (see below), whose sum is σ = 42184800. Its totient is φ = 6283008.

The previous prime is 18916031. The next prime is 18916063. The reversal of 18916038 is 83061981.

It is a junction number, because it is equal to n+sod(n) for n = 18915993 and 18916011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18916031) 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, 22978 + ... + 23786.

It is an arithmetic number, because the mean of its divisors is an integer number (1318275).

Almost surely, 2^18916038 is an apocalyptic number.

18916038 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18916038 is an abundant number, since it is smaller than the sum of its proper divisors (23268762).

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

18916038 is a wasteful number, since it uses less digits than its factorization.

18916038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18916038 is about 4349.2571779558. The cubic root of 18916038 is about 266.4465242177.

The spelling of 18916038 in words is "eighteen million, nine hundred sixteen thousand, thirty-eight".