18223982 has 12 divisors (see below), whose sum is σ = 31799160. Its totient is φ = 7810236.

The previous prime is 18223969. The next prime is 18223987. The reversal of 18223982 is 28932281.

It is a super-2 number, since 2×18223982² = 664227039872648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92882 + ... + 93077.

It is an arithmetic number, because the mean of its divisors is an integer number (2649930).

Almost surely, 2^18223982 is an apocalyptic number.

18223982 is a deficient number, since it is larger than the sum of its proper divisors (13575178).

18223982 is a wasteful number, since it uses less digits than its factorization.

18223982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185975 (or 185968 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 18223982 is about 4268.9556099824. The cubic root of 18223982 is about 263.1566965124.

The spelling of 18223982 in words is "eighteen million, two hundred twenty-three thousand, nine hundred eighty-two".