180185840 has 40 divisors (see below), whose sum is σ = 423655920. Its totient is φ = 71261696.

The previous prime is 180185821. The next prime is 180185843. The reversal of 180185840 is 48581081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 180185840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180185843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5534 + ... + 19773.

It is an arithmetic number, because the mean of its divisors is an integer number (10591398).

Almost surely, 2^180185840 is an apocalyptic number.

180185840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180185840 is an abundant number, since it is smaller than the sum of its proper divisors (243470080).

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

180185840 is a wasteful number, since it uses less digits than its factorization.

180185840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25409 (or 25403 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 180185840 is about 13423.3319261650. The cubic root of 180185840 is about 564.8158639783.

The spelling of 180185840 in words is "one hundred eighty million, one hundred eighty-five thousand, eight hundred forty".