399796987 has 8 divisors (see below), whose sum is σ = 426925440. Its totient is φ = 373558080.

The previous prime is 399796981. The next prime is 399797003. The reversal of 399796987 is 789697993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399796987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399796981) 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 in 7 ways as a sum of consecutive naturals, for example, 221458 + ... + 223255.

It is an arithmetic number, because the mean of its divisors is an integer number (53365680).

Almost surely, 2^399796987 is an apocalyptic number.

399796987 is a deficient number, since it is larger than the sum of its proper divisors (27128453).

399796987 is a wasteful number, since it uses less digits than its factorization.

399796987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444773.

The product of its digits is 46294416, while the sum is 67.

The square root of 399796987 is about 19994.9240308634. The cubic root of 399796987 is about 736.6816275862.

The spelling of 399796987 in words is "three hundred ninety-nine million, seven hundred ninety-six thousand, nine hundred eighty-seven".