18319432 has 8 divisors (see below), whose sum is σ = 34348950. Its totient is φ = 9159712.

The previous prime is 18319429. The next prime is 18319451. The reversal of 18319432 is 23491381.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 3218436 = 3886^2 + 1794^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18319394 and 18319403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1144957 + ... + 1144972.

Almost surely, 2^18319432 is an apocalyptic number.

It is an amenable number.

18319432 is a deficient number, since it is larger than the sum of its proper divisors (16029518).

18319432 is a wasteful number, since it uses less digits than its factorization.

18319432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289935 (or 2289931 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 18319432 is about 4280.1205590497. The cubic root of 18319432 is about 263.6153335727.

The spelling of 18319432 in words is "eighteen million, three hundred nineteen thousand, four hundred thirty-two".