18301397 has 2 divisors, whose sum is σ = 18301398. Its totient is φ = 18301396.

The previous prime is 18301391. The next prime is 18301447. The reversal of 18301397 is 79310381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13256881 + 5044516 = 3641^2 + 2246^2 .

It is a cyclic number.

It is not a de Polignac number, because 18301397 - 2¹⁸ = 18039253 is a prime.

It is a super-2 number, since 2×18301397² = 669882264303218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18301391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9150698 + 9150699.

It is an arithmetic number, because the mean of its divisors is an integer number (9150699).

Almost surely, 2^18301397 is an apocalyptic number.

It is an amenable number.

18301397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18301397 is an equidigital number, since it uses as much as digits as its factorization.

18301397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18301397 is about 4278.0132070857. The cubic root of 18301397 is about 263.5287977100.

The spelling of 18301397 in words is "eighteen million, three hundred one thousand, three hundred ninety-seven".