398639715 has 16 divisors (see below), whose sum is σ = 675343008. Its totient is φ = 200101376.

The previous prime is 398639707. The next prime is 398639719. The reversal of 398639715 is 517936893.

It is a cyclic number.

It is not a de Polignac number, because 398639715 - 2³ = 398639707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (398639719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781392 + ... + 781901.

It is an arithmetic number, because the mean of its divisors is an integer number (42208938).

Almost surely, 2^398639715 is an apocalyptic number.

398639715 is a deficient number, since it is larger than the sum of its proper divisors (276703293).

398639715 is a wasteful number, since it uses less digits than its factorization.

398639715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563318.

The product of its digits is 1224720, while the sum is 51.

The square root of 398639715 is about 19965.9639136206. The cubic root of 398639715 is about 735.9701290206.

The spelling of 398639715 in words is "three hundred ninety-eight million, six hundred thirty-nine thousand, seven hundred fifteen".