1813880 has 32 divisors (see below), whose sum is σ = 4123440. Its totient is φ = 718080.

The previous prime is 1813853. The next prime is 1813897. The reversal of 1813880 is 883181.

It is a happy number.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5315 + ... + 5645.

2^1813880 is an apocalyptic number.

1813880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813880 is an abundant number, since it is smaller than the sum of its proper divisors (2309560).

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

1813880 is a wasteful number, since it uses less digits than its factorization.

1813880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 1813880 is about 1346.8036233987. The cubic root of 1813880 is about 121.9559098944.

The spelling of 1813880 in words is "one million, eight hundred thirteen thousand, eight hundred eighty".