18091432 has 16 divisors (see below), whose sum is σ = 35396640. Its totient is φ = 8652336.

The previous prime is 18091429. The next prime is 18091457. The reversal of 18091432 is 23419081.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18091432.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48978 + ... + 49345.

It is an arithmetic number, because the mean of its divisors is an integer number (2212290).

Almost surely, 2^18091432 is an apocalyptic number.

It is an amenable number.

18091432 is a deficient number, since it is larger than the sum of its proper divisors (17305208).

18091432 is a wasteful number, since it uses less digits than its factorization.

18091432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98352 (or 98348 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 18091432 is about 4253.4024027830. The cubic root of 18091432 is about 262.5171302502.

The spelling of 18091432 in words is "eighteen million, ninety-one thousand, four hundred thirty-two".