397729815 has 24 divisors (see below), whose sum is σ = 740265840. Its totient is φ = 181819008.

The previous prime is 397729781. The next prime is 397729847. The reversal of 397729815 is 518927793.

It is not a de Polignac number, because 397729815 - 2¹² = 397725719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269830 + ... + 271299.

It is an arithmetic number, because the mean of its divisors is an integer number (30844410).

Almost surely, 2^397729815 is an apocalyptic number.

397729815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397729815 is a deficient number, since it is larger than the sum of its proper divisors (342536025).

397729815 is a wasteful number, since it uses less digits than its factorization.

397729815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541151 (or 541144 counting only the distinct ones).

The product of its digits is 952560, while the sum is 51.

The square root of 397729815 is about 19943.1646184852. The cubic root of 397729815 is about 735.4097488544.

The spelling of 397729815 in words is "three hundred ninety-seven million, seven hundred twenty-nine thousand, eight hundred fifteen".