397747907 has 4 divisors (see below), whose sum is σ = 398138496. Its totient is φ = 397357320.

The previous prime is 397747897. The next prime is 397747939. The reversal of 397747907 is 709747793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397747907 - 2¹⁰ = 397746883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397747967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193763 + ... + 195804.

It is an arithmetic number, because the mean of its divisors is an integer number (99534624).

Almost surely, 2^397747907 is an apocalyptic number.

397747907 is a deficient number, since it is larger than the sum of its proper divisors (390589).

397747907 is a wasteful number, since it uses less digits than its factorization.

397747907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390588.

The product of its (nonzero) digits is 2333772, while the sum is 53.

The square root of 397747907 is about 19943.6182023223. The cubic root of 397747907 is about 735.4208994990.

The spelling of 397747907 in words is "three hundred ninety-seven million, seven hundred forty-seven thousand, nine hundred seven".