397157506 has 8 divisors (see below), whose sum is σ = 596413584. Its totient is φ = 198352980.

The previous prime is 397157483. The next prime is 397157521. The reversal of 397157506 is 605751793.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110680 + ... + 114211.

It is an arithmetic number, because the mean of its divisors is an integer number (74551698).

Almost surely, 2^397157506 is an apocalyptic number.

397157506 is a deficient number, since it is larger than the sum of its proper divisors (199256078).

397157506 is a wasteful number, since it uses less digits than its factorization.

397157506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225776.

The product of its (nonzero) digits is 198450, while the sum is 43.

The square root of 397157506 is about 19928.8109529896. The cubic root of 397157506 is about 735.0568429051.

The spelling of 397157506 in words is "three hundred ninety-seven million, one hundred fifty-seven thousand, five hundred six".