180991420 has 24 divisors (see below), whose sum is σ = 390356064. Its totient is φ = 70439616.

The previous prime is 180991417. The next prime is 180991441. The reversal of 180991420 is 24199081.

It is a super-2 number, since 2×180991420² = 65515788227232800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121552 + ... + 123031.

It is an arithmetic number, because the mean of its divisors is an integer number (16264836).

Almost surely, 2^180991420 is an apocalyptic number.

180991420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180991420 is an abundant number, since it is smaller than the sum of its proper divisors (209364644).

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

180991420 is a wasteful number, since it uses less digits than its factorization.

180991420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244629 (or 244627 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 180991420 is about 13453.3051701060. The cubic root of 180991420 is about 565.6563443045.

The spelling of 180991420 in words is "one hundred eighty million, nine hundred ninety-one thousand, four hundred twenty".