979891900 has 144 divisors (see below), whose sum is σ = 2454217920. Its totient is φ = 336384000.

The previous prime is 979891879. The next prime is 979891901. The reversal of 979891900 is 9198979.

It is a super-2 number, since 2×979891900² = 1920376271371220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (979891901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2231881 + ... + 2232319.

It is an arithmetic number, because the mean of its divisors is an integer number (17043180).

Almost surely, 2^979891900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 979891900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227108960).

979891900 is an abundant number, since it is smaller than the sum of its proper divisors (1474326020).

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

979891900 is a wasteful number, since it uses less digits than its factorization.

979891900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 979891900 is about 31303.2250734649. The cubic root of 979891900 is about 993.2518651061.

The spelling of 979891900 in words is "nine hundred seventy-nine million, eight hundred ninety-one thousand, nine hundred".