399579487 has 4 divisors (see below), whose sum is σ = 413358120. Its totient is φ = 385800856.

The previous prime is 399579461. The next prime is 399579493. The reversal of 399579487 is 784975993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784975993 = 23 ⋅34129391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399579487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399579457) 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 3 ways as a sum of consecutive naturals, for example, 6889273 + ... + 6889330.

It is an arithmetic number, because the mean of its divisors is an integer number (103339530).

Almost surely, 2^399579487 is an apocalyptic number.

399579487 is a deficient number, since it is larger than the sum of its proper divisors (13778633).

399579487 is a wasteful number, since it uses less digits than its factorization.

399579487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778632.

The product of its digits is 17146080, while the sum is 61.

The square root of 399579487 is about 19989.4844105595. The cubic root of 399579487 is about 736.5480120062.

The spelling of 399579487 in words is "three hundred ninety-nine million, five hundred seventy-nine thousand, four hundred eighty-seven".