18266957 has 2 divisors, whose sum is σ = 18266958. Its totient is φ = 18266956.

The previous prime is 18266939. The next prime is 18266981. The reversal of 18266957 is 75966281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10588516 + 7678441 = 3254^2 + 2771^2 .

It is a cyclic number.

It is not a de Polignac number, because 18266957 - 2¹² = 18262861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18266257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133478 + 9133479.

It is an arithmetic number, because the mean of its divisors is an integer number (9133479).

Almost surely, 2^18266957 is an apocalyptic number.

It is an amenable number.

18266957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18266957 is an equidigital number, since it uses as much as digits as its factorization.

18266957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 18266957 is about 4273.9860785922. The cubic root of 18266957 is about 263.3633890101.

The spelling of 18266957 in words is "eighteen million, two hundred sixty-six thousand, nine hundred fifty-seven".