1979880 has 64 divisors (see below), whose sum is σ = 6791040. Its totient is φ = 452352.

The previous prime is 1979827. The next prime is 1979891. The reversal of 1979880 is 889791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339 + ... + 2018.

It is an arithmetic number, because the mean of its divisors is an integer number (106110).

2^1979880 is an apocalyptic number.

1979880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3395520).

1979880 is an abundant number, since it is smaller than the sum of its proper divisors (4811160).

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

1979880 is a wasteful number, since it uses less digits than its factorization.

1979880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1979880 is about 1407.0820871577. The cubic root of 1979880 is about 125.5681867308.

The spelling of 1979880 in words is "one million, nine hundred seventy-nine thousand, eight hundred eighty".