1816980 has 48 divisors (see below), whose sum is σ = 5552064. Its totient is φ = 440320.

The previous prime is 1816979. The next prime is 1816987. The reversal of 1816980 is 896181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717 + ... + 2036.

It is an arithmetic number, because the mean of its divisors is an integer number (115668).

2^1816980 is an apocalyptic number.

1816980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816980 is an abundant number, since it is smaller than the sum of its proper divisors (3735084).

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

1816980 is a wasteful number, since it uses less digits than its factorization.

1816980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776 (or 2774 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1816980 is about 1347.9540051500. The cubic root of 1816980 is about 122.0253463417.

The spelling of 1816980 in words is "one million, eight hundred sixteen thousand, nine hundred eighty".