397442739 has 4 divisors (see below), whose sum is σ = 529923656. Its totient is φ = 264961824.

The previous prime is 397442713. The next prime is 397442743. The reversal of 397442739 is 937244793.

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

It is not a de Polignac number, because 397442739 - 2⁷ = 397442611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397441739) 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, 66240454 + ... + 66240459.

It is an arithmetic number, because the mean of its divisors is an integer number (132480914).

Almost surely, 2^397442739 is an apocalyptic number.

397442739 is a deficient number, since it is larger than the sum of its proper divisors (132480917).

397442739 is a wasteful number, since it uses less digits than its factorization.

397442739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132480916.

The product of its digits is 1143072, while the sum is 48.

The square root of 397442739 is about 19935.9659660624. The cubic root of 397442739 is about 735.2327699979.

The spelling of 397442739 in words is "three hundred ninety-seven million, four hundred forty-two thousand, seven hundred thirty-nine".