239521397 has 2 divisors, whose sum is σ = 239521398. Its totient is φ = 239521396.

The previous prime is 239521393. The next prime is 239521409. The reversal of 239521397 is 793125932.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120253156 + 119268241 = 10966^2 + 10921^2 .

It is a cyclic number.

It is not a de Polignac number, because 239521397 - 2² = 239521393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239521393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119760698 + 119760699.

It is an arithmetic number, because the mean of its divisors is an integer number (119760699).

Almost surely, 2^239521397 is an apocalyptic number.

It is an amenable number.

239521397 is a deficient number, since it is larger than the sum of its proper divisors (1).

239521397 is an equidigital number, since it uses as much as digits as its factorization.

239521397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 41.

The square root of 239521397 is about 15476.4788307935. The cubic root of 239521397 is about 621.0331344044.

The spelling of 239521397 in words is "two hundred thirty-nine million, five hundred twenty-one thousand, three hundred ninety-seven".