979990 has 32 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 348000.

The previous prime is 979987. The next prime is 980027. The reversal of 979990 is 99979.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6415 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (61560).

2⁹⁷⁹⁹⁹⁰ is an apocalyptic number.

979990 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

979990 is a wasteful number, since it uses less digits than its factorization.

979990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 979990 is about 989.9444428856. The cubic root of 979990 is about 99.3285009836.

It can be divided in two parts, 9799 and 90, that added together give a palindrome (9889).

The spelling of 979990 in words is "nine hundred seventy-nine thousand, nine hundred ninety".