397107431 has 4 divisors (see below), whose sum is σ = 453837072. Its totient is φ = 340377792.

The previous prime is 397107419. The next prime is 397107433. The reversal of 397107431 is 134701793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134701793 = 37 ⋅3640589.

It is a cyclic number.

It is not a de Polignac number, because 397107431 - 2⁶ = 397107367 is a prime.

It is a super-2 number, since 2×397107431² = 315388623510839522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397107391 and 397107400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397107433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28364810 + ... + 28364823.

It is an arithmetic number, because the mean of its divisors is an integer number (113459268).

Almost surely, 2^397107431 is an apocalyptic number.

397107431 is a deficient number, since it is larger than the sum of its proper divisors (56729641).

397107431 is an equidigital number, since it uses as much as digits as its factorization.

397107431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56729640.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 397107431 is about 19927.5545664790. The cubic root of 397107431 is about 735.0259487653.

The spelling of 397107431 in words is "three hundred ninety-seven million, one hundred seven thousand, four hundred thirty-one".