18430956 has 48 divisors (see below), whose sum is σ = 48814080. Its totient is φ = 6011280.

The previous prime is 18430943. The next prime is 18431011. The reversal of 18430956 is 65903481.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18430956.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3261 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (1016960).

Almost surely, 2^18430956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18430956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24407040).

18430956 is an abundant number, since it is smaller than the sum of its proper divisors (30383124).

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

18430956 is a wasteful number, since it uses less digits than its factorization.

18430956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691 (or 3683 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 18430956 is about 4293.1289288816. The cubic root of 18430956 is about 264.1491925315.

The spelling of 18430956 in words is "eighteen million, four hundred thirty thousand, nine hundred fifty-six".