1881980 has 12 divisors (see below), whose sum is σ = 3952200. Its totient is φ = 752784.

The previous prime is 1881961. The next prime is 1881983. The reversal of 1881980 is 891881.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1881980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47030 + ... + 47069.

It is an arithmetic number, because the mean of its divisors is an integer number (329350).

2^1881980 is an apocalyptic number.

1881980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881980 is an abundant number, since it is smaller than the sum of its proper divisors (2070220).

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

1881980 is a wasteful number, since it uses less digits than its factorization.

1881980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94108 (or 94106 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1881980 is about 1371.8527617788. The cubic root of 1881980 is about 123.4634289920.

Subtracting from 1881980 its reverse (891881), we obtain a palindrome (990099).

The spelling of 1881980 in words is "one million, eight hundred eighty-one thousand, nine hundred eighty".