394797731 has 2 divisors, whose sum is σ = 394797732. Its totient is φ = 394797730.

The previous prime is 394797727. The next prime is 394797773. The reversal of 394797731 is 137797493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394797731 - 2² = 394797727 is a prime.

It is a super-2 number, since 2×394797731² = 311730496805496722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394797731.

It is not a weakly prime, because it can be changed into another prime (394797131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197398865 + 197398866.

It is an arithmetic number, because the mean of its divisors is an integer number (197398866).

Almost surely, 2^394797731 is an apocalyptic number.

394797731 is a deficient number, since it is larger than the sum of its proper divisors (1).

394797731 is an equidigital number, since it uses as much as digits as its factorization.

394797731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000188, while the sum is 50.

The square root of 394797731 is about 19869.5176338028. The cubic root of 394797731 is about 733.5981306591.

The spelling of 394797731 in words is "three hundred ninety-four million, seven hundred ninety-seven thousand, seven hundred thirty-one".