399354427 has 2 divisors, whose sum is σ = 399354428. Its totient is φ = 399354426.

The previous prime is 399354409. The next prime is 399354433. The reversal of 399354427 is 724453993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399354427 - 2⁷ = 399354299 is a prime.

It is not a weakly prime, because it can be changed into another prime (399354437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199677213 + 199677214.

It is an arithmetic number, because the mean of its divisors is an integer number (199677214).

Almost surely, 2^399354427 is an apocalyptic number.

399354427 is a deficient number, since it is larger than the sum of its proper divisors (1).

399354427 is an equidigital number, since it uses as much as digits as its factorization.

399354427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 46.

The square root of 399354427 is about 19983.8541577945. The cubic root of 399354427 is about 736.4097010792.

The spelling of 399354427 in words is "three hundred ninety-nine million, three hundred fifty-four thousand, four hundred twenty-seven".