1979800 has 48 divisors (see below), whose sum is σ = 4854600. Its totient is φ = 748800.

The previous prime is 1979779. The next prime is 1979807. The reversal of 1979800 is 89791.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979807) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3540 + ... + 4060.

2^1979800 is an apocalyptic number.

1979800 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 1979800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427300).

1979800 is an abundant number, since it is smaller than the sum of its proper divisors (2874800).

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

1979800 is a wasteful number, since it uses less digits than its factorization.

1979800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1979800 is about 1407.0536592469. The cubic root of 1979800 is about 125.5664954515.

The spelling of 1979800 in words is "one million, nine hundred seventy-nine thousand, eight hundred".