1801380 has 48 divisors (see below), whose sum is σ = 5765760. Its totient is φ = 411648.

The previous prime is 1801363. The next prime is 1801403. The reversal of 1801380 is 831081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 2564.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2^1801380 is an apocalyptic number.

1801380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801380 is an abundant number, since it is smaller than the sum of its proper divisors (3964380).

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

1801380 is a wasteful number, since it uses less digits than its factorization.

1801380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1801380 is about 1342.1549835991. The cubic root of 1801380 is about 121.6751187806.

Subtracting from 1801380 its reverse (831081), we obtain a cube (970299 = 99³).

The spelling of 1801380 in words is "one million, eight hundred one thousand, three hundred eighty".