399726887 has 8 divisors (see below), whose sum is σ = 460118400. Its totient is φ = 340157304.

The previous prime is 399726863. The next prime is 399726893. The reversal of 399726887 is 788627993.

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 399726887 - 2⁶ = 399726823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399726827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204437 + ... + 206382.

It is an arithmetic number, because the mean of its divisors is an integer number (57514800).

Almost surely, 2^399726887 is an apocalyptic number.

399726887 is a deficient number, since it is larger than the sum of its proper divisors (60391513).

399726887 is a wasteful number, since it uses less digits than its factorization.

399726887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410965.

The product of its digits is 9144576, while the sum is 59.

The square root of 399726887 is about 19993.1710091221. The cubic root of 399726887 is about 736.6385687319.

The spelling of 399726887 in words is "three hundred ninety-nine million, seven hundred twenty-six thousand, eight hundred eighty-seven".