18036978 has 16 divisors (see below), whose sum is σ = 37238016. Its totient is φ = 5818320.

The previous prime is 18036971. The next prime is 18037001. The reversal of 18036978 is 87963081.

It is not an unprimeable number, because it can be changed into a prime (18036971) 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, 48301 + ... + 48672.

It is an arithmetic number, because the mean of its divisors is an integer number (2327376).

Almost surely, 2^18036978 is an apocalyptic number.

18036978 is an abundant number, since it is smaller than the sum of its proper divisors (19201038).

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

18036978 is a wasteful number, since it uses less digits than its factorization.

18036978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97009.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18036978 is about 4246.9963503634. The cubic root of 18036978 is about 262.2534792158.

The spelling of 18036978 in words is "eighteen million, thirty-six thousand, nine hundred seventy-eight".