1807940 has 12 divisors (see below), whose sum is σ = 3796716. Its totient is φ = 723168.

The previous prime is 1807921. The next prime is 1807943. The reversal of 1807940 is 497081.

It can be written as a sum of positive squares in 2 ways, for example, as 215296 + 1592644 = 464^2 + 1262^2 .

It is not an unprimeable number, because it can be changed into a prime (1807943) 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, 45179 + ... + 45218.

It is an arithmetic number, because the mean of its divisors is an integer number (316393).

2^1807940 is an apocalyptic number.

1807940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1807940 is an abundant number, since it is smaller than the sum of its proper divisors (1988776).

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

1807940 is a wasteful number, since it uses less digits than its factorization.

1807940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90406 (or 90404 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1807940 is about 1344.5965937782. The cubic root of 1807940 is about 121.8226393530.

The spelling of 1807940 in words is "one million, eight hundred seven thousand, nine hundred forty".