399951427 has 2 divisors, whose sum is σ = 399951428. Its totient is φ = 399951426.

The previous prime is 399951407. The next prime is 399951437. The reversal of 399951427 is 724159993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399951427 is a prime.

It is a super-2 number, since 2×399951427² = 319922287918672658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399951407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199975713 + 199975714.

It is an arithmetic number, because the mean of its divisors is an integer number (199975714).

Almost surely, 2^399951427 is an apocalyptic number.

399951427 is a deficient number, since it is larger than the sum of its proper divisors (1).

399951427 is an equidigital number, since it uses as much as digits as its factorization.

399951427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 399951427 is about 19998.7856381331. The cubic root of 399951427 is about 736.7764744438.

The spelling of 399951427 in words is "three hundred ninety-nine million, nine hundred fifty-one thousand, four hundred twenty-seven".