394429727 has 2 divisors, whose sum is σ = 394429728. Its totient is φ = 394429726.

The previous prime is 394429649. The next prime is 394429729. The reversal of 394429727 is 727924493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394429727 - 2²² = 390235423 is a prime.

Together with 394429729, 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 (394429729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197214863 + 197214864.

It is an arithmetic number, because the mean of its divisors is an integer number (197214864).

Almost surely, 2^394429727 is an apocalyptic number.

394429727 is a deficient number, since it is larger than the sum of its proper divisors (1).

394429727 is an equidigital number, since it uses as much as digits as its factorization.

394429727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 47.

The square root of 394429727 is about 19860.2549580815. The cubic root of 394429727 is about 733.3701227870.

The spelling of 394429727 in words is "three hundred ninety-four million, four hundred twenty-nine thousand, seven hundred twenty-seven".