399985387 has 8 divisors (see below), whose sum is σ = 423256320. Its totient is φ = 377204520.

The previous prime is 399985379. The next prime is 399985459. The reversal of 399985387 is 783589993.

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

It is a cyclic number.

It is not a de Polignac number, because 399985387 - 2³ = 399985379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399985307) 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, 120837 + ... + 124102.

It is an arithmetic number, because the mean of its divisors is an integer number (52907040).

Almost surely, 2^399985387 is an apocalyptic number.

399985387 is a deficient number, since it is larger than the sum of its proper divisors (23270933).

399985387 is a wasteful number, since it uses less digits than its factorization.

399985387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245033.

The product of its digits is 14696640, while the sum is 61.

The square root of 399985387 is about 19999.6346716634. The cubic root of 399985387 is about 736.7973271601.

The spelling of 399985387 in words is "three hundred ninety-nine million, nine hundred eighty-five thousand, three hundred eighty-seven".