397929629 has 2 divisors, whose sum is σ = 397929630. Its totient is φ = 397929628.

The previous prime is 397929607. The next prime is 397929691. The reversal of 397929629 is 926929793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379353529 + 18576100 = 19477^2 + 4310^2 .

It is an emirp because it is prime and its reverse (926929793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397929629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397929229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198964814 + 198964815.

It is an arithmetic number, because the mean of its divisors is an integer number (198964815).

Almost surely, 2^397929629 is an apocalyptic number.

It is an amenable number.

397929629 is a deficient number, since it is larger than the sum of its proper divisors (1).

397929629 is an equidigital number, since it uses as much as digits as its factorization.

397929629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 56.

The square root of 397929629 is about 19948.1735755432. The cubic root of 397929629 is about 735.5328814913.

The spelling of 397929629 in words is "three hundred ninety-seven million, nine hundred twenty-nine thousand, six hundred twenty-nine".