18890916 has 24 divisors (see below), whose sum is σ = 48086304. Its totient is φ = 5724480.

The previous prime is 18890909. The next prime is 18890917. The reversal of 18890916 is 61909881.

It is not an unprimeable number, because it can be changed into a prime (18890917) 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, 71425 + ... + 71688.

It is an arithmetic number, because the mean of its divisors is an integer number (2003596).

Almost surely, 2^18890916 is an apocalyptic number.

It is an amenable number.

18890916 is an abundant number, since it is smaller than the sum of its proper divisors (29195388).

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

18890916 is a wasteful number, since it uses less digits than its factorization.

18890916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143131 (or 143129 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18890916 is about 4346.3681390329. The cubic root of 18890916 is about 266.3285179169.

The spelling of 18890916 in words is "eighteen million, eight hundred ninety thousand, nine hundred sixteen".