18195957 has 12 divisors (see below), whose sum is σ = 28305004. Its totient is φ = 11197440.

The previous prime is 18195937. The next prime is 18196019. The reversal of 18195957 is 75959181.

It can be written as a sum of positive squares in 2 ways, for example, as 5171076 + 13024881 = 2274^2 + 3609^2 .

It is not a de Polignac number, because 18195957 - 2⁶ = 18195893 is a prime.

It is a super-2 number, since 2×18195957² = 662185702291698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77644 + ... + 77877.

Almost surely, 2^18195957 is an apocalyptic number.

It is an amenable number.

18195957 is a deficient number, since it is larger than the sum of its proper divisors (10109047).

18195957 is a wasteful number, since it uses less digits than its factorization.

18195957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155540 (or 155537 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 18195957 is about 4265.6719283133. The cubic root of 18195957 is about 263.0217324107.

It can be divided in two parts, 1819 and 5957, that added together give a 5-th power (7776 = 6⁵).

The spelling of 18195957 in words is "eighteen million, one hundred ninety-five thousand, nine hundred fifty-seven".