397681829 has 2 divisors, whose sum is σ = 397681830. Its totient is φ = 397681828.

The previous prime is 397681787. The next prime is 397681841. The reversal of 397681829 is 928186793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303630625 + 94051204 = 17425^2 + 9698^2 .

It is an emirp because it is prime and its reverse (928186793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397681829 - 2²⁴ = 380904613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397681849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198840914 + 198840915.

It is an arithmetic number, because the mean of its divisors is an integer number (198840915).

Almost surely, 2^397681829 is an apocalyptic number.

It is an amenable number.

397681829 is a deficient number, since it is larger than the sum of its proper divisors (1).

397681829 is an equidigital number, since it uses as much as digits as its factorization.

397681829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 397681829 is about 19941.9615133517. The cubic root of 397681829 is about 735.3801719992.

The spelling of 397681829 in words is "three hundred ninety-seven million, six hundred eighty-one thousand, eight hundred twenty-nine".