1980918 has 12 divisors (see below), whose sum is σ = 4292028. Its totient is φ = 660300.

The previous prime is 1980911. The next prime is 1980919. The reversal of 1980918 is 8190891.

It is a super-2 number, since 2×1980918² = 7848072245448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55008 + ... + 55043.

It is an arithmetic number, because the mean of its divisors is an integer number (357669).

2^1980918 is an apocalyptic number.

1980918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1980918 is an abundant number, since it is smaller than the sum of its proper divisors (2311110).

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

1980918 is a wasteful number, since it uses less digits than its factorization.

1980918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110059 (or 110056 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1980918 is about 1407.4508872426. The cubic root of 1980918 is about 125.5901269505.

The spelling of 1980918 in words is "one million, nine hundred eighty thousand, nine hundred eighteen".