397699349 has 2 divisors, whose sum is σ = 397699350. Its totient is φ = 397699348.

The previous prime is 397699339. The next prime is 397699381. The reversal of 397699349 is 943996793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375778225 + 21921124 = 19385^2 + 4682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397699349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397699339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198849674 + 198849675.

It is an arithmetic number, because the mean of its divisors is an integer number (198849675).

Almost surely, 2^397699349 is an apocalyptic number.

It is an amenable number.

397699349 is a deficient number, since it is larger than the sum of its proper divisors (1).

397699349 is an equidigital number, since it uses as much as digits as its factorization.

397699349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 59.

The square root of 397699349 is about 19942.4007832558. The cubic root of 397699349 is about 735.3909709767.

The spelling of 397699349 in words is "three hundred ninety-seven million, six hundred ninety-nine thousand, three hundred forty-nine".