615983994 has 16 divisors (see below), whose sum is σ = 1368853440. Its totient is φ = 205327980.

The previous prime is 615983989. The next prime is 615984007. The reversal of 615983994 is 499389516.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 11407111 = 615983994 / (6 + 1 + 5 + 9 + 8 + 3 + 9 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 615983994.

It is an unprimeable number.

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, 5703502 + ... + 5703609.

It is an arithmetic number, because the mean of its divisors is an integer number (85553340).

Almost surely, 2^615983994 is an apocalyptic number.

615983994 is an abundant number, since it is smaller than the sum of its proper divisors (752869446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

615983994 is a wasteful number, since it uses less digits than its factorization.

615983994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11407122 (or 11407116 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 615983994 is about 24819.0248398280. The cubic root of 615983994 is about 850.8568034072.

The spelling of 615983994 in words is "six hundred fifteen million, nine hundred eighty-three thousand, nine hundred ninety-four".