1640180 has 12 divisors (see below), whose sum is σ = 3444420. Its totient is φ = 656064.

The previous prime is 1640167. The next prime is 1640183. The reversal of 1640180 is 810461.

It can be written as a sum of positive squares in 2 ways, for example, as 1175056 + 465124 = 1084^2 + 682^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 82009 = 1640180 / (1 + 6 + 4 + 0 + 1 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640183) 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, 40985 + ... + 41024.

It is an arithmetic number, because the mean of its divisors is an integer number (287035).

2^1640180 is an apocalyptic number.

1640180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640180 is an abundant number, since it is smaller than the sum of its proper divisors (1804240).

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

1640180 is a wasteful number, since it uses less digits than its factorization.

1640180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82018 (or 82016 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1640180 is about 1280.6951237512. The cubic root of 1640180 is about 117.9316850576.

The spelling of 1640180 in words is "one million, six hundred forty thousand, one hundred eighty".