18418432 has 18 divisors (see below), whose sum is σ = 36765428. Its totient is φ = 9209088.

The previous prime is 18418427. The next prime is 18418441. The reversal of 18418432 is 23481481.

It is a junction number, because it is equal to n+sod(n) for n = 18418394 and 18418403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35718 + ... + 36229.

Almost surely, 2^18418432 is an apocalyptic number.

It is an amenable number.

18418432 is a deficient number, since it is larger than the sum of its proper divisors (18346996).

18418432 is an frugal number, since it uses more digits than its factorization.

18418432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71963 (or 71949 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 18418432 is about 4291.6700711961. The cubic root of 18418432 is about 264.0893483923.

The spelling of 18418432 in words is "eighteen million, four hundred eighteen thousand, four hundred thirty-two".