397264639 has 2 divisors, whose sum is σ = 397264640. Its totient is φ = 397264638.

The previous prime is 397264601. The next prime is 397264661. The reversal of 397264639 is 936462793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397264639 - 2¹⁵ = 397231871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397264592 and 397264601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397264669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198632319 + 198632320.

It is an arithmetic number, because the mean of its divisors is an integer number (198632320).

Almost surely, 2^397264639 is an apocalyptic number.

397264639 is a deficient number, since it is larger than the sum of its proper divisors (1).

397264639 is an equidigital number, since it uses as much as digits as its factorization.

397264639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 49.

The square root of 397264639 is about 19931.4986641748. The cubic root of 397264639 is about 735.1229306778.

The spelling of 397264639 in words is "three hundred ninety-seven million, two hundred sixty-four thousand, six hundred thirty-nine".