180427821 has 16 divisors (see below), whose sum is σ = 284419200. Its totient is φ = 99546048.

The previous prime is 180427811. The next prime is 180427823. The reversal of 180427821 is 128724081.

It is a happy number.

It is not a de Polignac number, because 180427821 - 2⁷ = 180427693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180427823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147526 + ... + 148743.

It is an arithmetic number, because the mean of its divisors is an integer number (17776200).

Almost surely, 2^180427821 is an apocalyptic number.

It is an amenable number.

180427821 is a deficient number, since it is larger than the sum of its proper divisors (103991379).

180427821 is a wasteful number, since it uses less digits than its factorization.

180427821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296308.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 180427821 is about 13432.3423497170. The cubic root of 180427821 is about 565.0685911454.

The spelling of 180427821 in words is "one hundred eighty million, four hundred twenty-seven thousand, eight hundred twenty-one".