398039715 has 12 divisors (see below), whose sum is σ = 689935584. Its totient is φ = 212287824.

The previous prime is 398039713. The next prime is 398039731. The reversal of 398039715 is 517930893.

It is a happy number.

It is not a de Polignac number, because 398039715 - 2¹ = 398039713 is a prime.

It is a super-2 number, since 2×398039715² = 316871229434562450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 8845327 = 398039715 / (3 + 9 + 8 + 0 + 3 + 9 + 7 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (398039713) 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 11 ways as a sum of consecutive naturals, for example, 4422619 + ... + 4422708.

It is an arithmetic number, because the mean of its divisors is an integer number (57494632).

Almost surely, 2^398039715 is an apocalyptic number.

398039715 is a deficient number, since it is larger than the sum of its proper divisors (291895869).

398039715 is a wasteful number, since it uses less digits than its factorization.

398039715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845338 (or 8845335 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 398039715 is about 19950.9326849649. The cubic root of 398039715 is about 735.6007028691.

The spelling of 398039715 in words is "three hundred ninety-eight million, thirty-nine thousand, seven hundred fifteen".