397438729 has 8 divisors (see below), whose sum is σ = 405043520. Its totient is φ = 389869200.

The previous prime is 397438697. The next prime is 397438739. The reversal of 397438729 is 927834793.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397438729 - 2⁵ = 397438697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397438739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14524 + ... + 31714.

It is an arithmetic number, because the mean of its divisors is an integer number (50630440).

Almost surely, 2^397438729 is an apocalyptic number.

It is an amenable number.

397438729 is a deficient number, since it is larger than the sum of its proper divisors (7604791).

397438729 is a wasteful number, since it uses less digits than its factorization.

397438729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17631.

The product of its digits is 2286144, while the sum is 52.

The square root of 397438729 is about 19935.8653938072. The cubic root of 397438729 is about 735.2302972783.

The spelling of 397438729 in words is "three hundred ninety-seven million, four hundred thirty-eight thousand, seven hundred twenty-nine".