399683387 has 2 divisors, whose sum is σ = 399683388. Its totient is φ = 399683386.

The previous prime is 399683381. The next prime is 399683393. The reversal of 399683387 is 783386993.

It is a balanced prime because it is at equal distance from previous prime (399683381) and next prime (399683393).

It is an emirp because it is prime and its reverse (783386993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399683387 - 2²⁸ = 131247931 is a prime.

It is not a weakly prime, because it can be changed into another prime (399683381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199841693 + 199841694.

It is an arithmetic number, because the mean of its divisors is an integer number (199841694).

Almost surely, 2^399683387 is an apocalyptic number.

399683387 is a deficient number, since it is larger than the sum of its proper divisors (1).

399683387 is an equidigital number, since it uses as much as digits as its factorization.

399683387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The square root of 399683387 is about 19992.0831080706. The cubic root of 399683387 is about 736.6118463695.

The spelling of 399683387 in words is "three hundred ninety-nine million, six hundred eighty-three thousand, three hundred eighty-seven".