397652909 has 2 divisors, whose sum is σ = 397652910. Its totient is φ = 397652908.

The previous prime is 397652887. The next prime is 397652929. The reversal of 397652909 is 909256793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333172009 + 64480900 = 18253^2 + 8030^2 .

It is an emirp because it is prime and its reverse (909256793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397652909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397652929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198826454 + 198826455.

It is an arithmetic number, because the mean of its divisors is an integer number (198826455).

Almost surely, 2^397652909 is an apocalyptic number.

It is an amenable number.

397652909 is a deficient number, since it is larger than the sum of its proper divisors (1).

397652909 is an equidigital number, since it uses as much as digits as its factorization.

397652909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 50.

The square root of 397652909 is about 19941.2363959710. The cubic root of 397652909 is about 735.3623455958.

The spelling of 397652909 in words is "three hundred ninety-seven million, six hundred fifty-two thousand, nine hundred nine".