394729631 has 2 divisors, whose sum is σ = 394729632. Its totient is φ = 394729630.

The previous prime is 394729609. The next prime is 394729633. The reversal of 394729631 is 136927493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394729631 - 2⁶ = 394729567 is a prime.

It is a super-2 number, since 2×394729631² = 311622963178792322, which contains 22 as substring.

Together with 394729633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394729633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197364815 + 197364816.

It is an arithmetic number, because the mean of its divisors is an integer number (197364816).

Almost surely, 2^394729631 is an apocalyptic number.

394729631 is a deficient number, since it is larger than the sum of its proper divisors (1).

394729631 is an equidigital number, since it uses as much as digits as its factorization.

394729631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 394729631 is about 19867.8038796441. The cubic root of 394729631 is about 733.5559479568. Note that the first 3 decimals are identical.

The spelling of 394729631 in words is "three hundred ninety-four million, seven hundred twenty-nine thousand, six hundred thirty-one".