18718956 has 18 divisors (see below), whose sum is σ = 47317452. Its totient is φ = 6239640.

The previous prime is 18718951. The next prime is 18718957. The reversal of 18718956 is 65981781.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (18718951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 259950 + ... + 260021.

Almost surely, 2^18718956 is an apocalyptic number.

It is an amenable number.

18718956 is an abundant number, since it is smaller than the sum of its proper divisors (28598496).

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

18718956 is a wasteful number, since it uses less digits than its factorization.

18718956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519981 (or 519976 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 18718956 is about 4326.5408815820. The cubic root of 18718956 is about 265.5179427584.

The spelling of 18718956 in words is "eighteen million, seven hundred eighteen thousand, nine hundred fifty-six".