399667 has 2 divisors, whose sum is σ = 399668. Its totient is φ = 399666.

The previous prime is 399647. The next prime is 399677. The reversal of 399667 is 766993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399667 is a prime.

It is not a weakly prime, because it can be changed into another prime (399617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199833 + 199834.

It is an arithmetic number, because the mean of its divisors is an integer number (199834).

2³⁹⁹⁶⁶⁷ is an apocalyptic number.

399667 is a deficient number, since it is larger than the sum of its proper divisors (1).

399667 is an equidigital number, since it uses as much as digits as its factorization.

399667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 399667 is about 632.1922176047. The cubic root of 399667 is about 73.6601779215.

The spelling of 399667 in words is "three hundred ninety-nine thousand, six hundred sixty-seven".