18697953 has 12 divisors (see below), whose sum is σ = 25823408. Its totient is φ = 12033840.

The previous prime is 18697949. The next prime is 18697961. The reversal of 18697953 is 35979681.

It is not a de Polignac number, because 18697953 - 2² = 18697949 is a prime.

It is a super-2 number, since 2×18697953² = 699226892780418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18697253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1183 + ... + 6228.

Almost surely, 2^18697953 is an apocalyptic number.

It is an amenable number.

18697953 is a deficient number, since it is larger than the sum of its proper divisors (7125455).

18697953 is an equidigital number, since it uses as much as digits as its factorization.

18697953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7472 (or 7443 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 18697953 is about 4324.1129726222. The cubic root of 18697953 is about 265.4186003171.

It can be divided in two parts, 18 and 697953, that added together give a triangular number (697971 = T₁₁₈₁).

The spelling of 18697953 in words is "eighteen million, six hundred ninety-seven thousand, nine hundred fifty-three".