18367397 has 2 divisors, whose sum is σ = 18367398. Its totient is φ = 18367396.

The previous prime is 18367387. The next prime is 18367399. The reversal of 18367397 is 79376381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 1442401 = 4114^2 + 1201^2 .

It is a cyclic number.

It is not a de Polignac number, because 18367397 - 2⁴ = 18367381 is a prime.

It is a super-2 number, since 2×18367397² = 674722545111218, which contains 22 as substring.

Together with 18367399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18367399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183698 + 9183699.

It is an arithmetic number, because the mean of its divisors is an integer number (9183699).

Almost surely, 2^18367397 is an apocalyptic number.

It is an amenable number.

18367397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18367397 is an equidigital number, since it uses as much as digits as its factorization.

18367397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 18367397 is about 4285.7201261865. The cubic root of 18367397 is about 263.8452040575.

The spelling of 18367397 in words is "eighteen million, three hundred sixty-seven thousand, three hundred ninety-seven".