399727 has 2 divisors, whose sum is σ = 399728. Its totient is φ = 399726.

The previous prime is 399719. The next prime is 399731. The reversal of 399727 is 727993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399727 - 2³ = 399719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199863 + 199864.

It is an arithmetic number, because the mean of its divisors is an integer number (199864).

2³⁹⁹⁷²⁷ is an apocalyptic number.

399727 is a deficient number, since it is larger than the sum of its proper divisors (1).

399727 is an equidigital number, since it uses as much as digits as its factorization.

399727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 37.

The square root of 399727 is about 632.2396697456. The cubic root of 399727 is about 73.6638638146.

The spelling of 399727 in words is "three hundred ninety-nine thousand, seven hundred twenty-seven".