18223936 has 14 divisors (see below), whose sum is σ = 36163250. Its totient is φ = 9111936.

The previous prime is 18223927. The next prime is 18223951. The reversal of 18223936 is 63932281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16646400 + 1577536 = 4080^2 + 1256^2 .

It is a super-2 number, since 2×18223936² = 664223686664192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142311 + ... + 142438.

Almost surely, 2^18223936 is an apocalyptic number.

18223936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18223936 is a deficient number, since it is larger than the sum of its proper divisors (17939314).

18223936 is an equidigital number, since it uses as much as digits as its factorization.

18223936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284761 (or 284751 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 18223936 is about 4268.9502222443. The cubic root of 18223936 is about 263.1564750969.

The spelling of 18223936 in words is "eighteen million, two hundred twenty-three thousand, nine hundred thirty-six".