18071956 has 24 divisors (see below), whose sum is σ = 36382976. Its totient is φ = 7693920.

The previous prime is 18071929. The next prime is 18071957. The reversal of 18071956 is 65917081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071957) 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, 2341 + ... + 6451.

Almost surely, 2^18071956 is an apocalyptic number.

It is an amenable number.

18071956 is an abundant number, since it is smaller than the sum of its proper divisors (18311020).

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

18071956 is a wasteful number, since it uses less digits than its factorization.

18071956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279 (or 4277 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 18071956 is about 4251.1123250274. The cubic root of 18071956 is about 262.4228937553.

The spelling of 18071956 in words is "eighteen million, seventy-one thousand, nine hundred fifty-six".