397740529 has 2 divisors, whose sum is σ = 397740530. Its totient is φ = 397740528.

The previous prime is 397740487. The next prime is 397740533. The reversal of 397740529 is 925047793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268304400 + 129436129 = 16380^2 + 11377^2 .

It is a cyclic number.

It is not a de Polignac number, because 397740529 - 2²⁷ = 263522801 is a prime.

It is not a weakly prime, because it can be changed into another prime (397740559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198870264 + 198870265.

It is an arithmetic number, because the mean of its divisors is an integer number (198870265).

Almost surely, 2^397740529 is an apocalyptic number.

It is an amenable number.

397740529 is a deficient number, since it is larger than the sum of its proper divisors (1).

397740529 is an equidigital number, since it uses as much as digits as its factorization.

397740529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 397740529 is about 19943.4332300133. The cubic root of 397740529 is about 735.4163522562.

The spelling of 397740529 in words is "three hundred ninety-seven million, seven hundred forty thousand, five hundred twenty-nine".