18193957 has 2 divisors, whose sum is σ = 18193958. Its totient is φ = 18193956.

The previous prime is 18193913. The next prime is 18193969. The reversal of 18193957 is 75939181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16208676 + 1985281 = 4026^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 18193957 - 2¹¹ = 18191909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18193057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9096978 + 9096979.

It is an arithmetic number, because the mean of its divisors is an integer number (9096979).

Almost surely, 2^18193957 is an apocalyptic number.

It is an amenable number.

18193957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18193957 is an equidigital number, since it uses as much as digits as its factorization.

18193957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 18193957 is about 4265.4374922158. The cubic root of 18193957 is about 263.0120954212.

It can be divided in two parts, 1819 and 3957, that added together give a square (5776 = 76²).

The spelling of 18193957 in words is "eighteen million, one hundred ninety-three thousand, nine hundred fifty-seven".