899979 has 4 divisors (see below), whose sum is σ = 1199976. Its totient is φ = 599984.

The previous prime is 899971. The next prime is 899981. The reversal of 899979 is 979998.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 899979 - 2³ = 899971 is a prime.

It is a D-number.

899979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (899971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149994 + ... + 149999.

It is an arithmetic number, because the mean of its divisors is an integer number (299994).

2⁸⁹⁹⁹⁷⁹ is an apocalyptic number.

899979 is a deficient number, since it is larger than the sum of its proper divisors (299997).

899979 is a wasteful number, since it uses less digits than its factorization.

899979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299996.

The product of its digits is 367416, while the sum is 51.

The square root of 899979 is about 948.6722300141. The cubic root of 899979 is about 96.5481875185.

The spelling of 899979 in words is "eight hundred ninety-nine thousand, nine hundred seventy-nine".