180621 has 24 divisors (see below), whose sum is σ = 309504. Its totient is φ = 99360.

The previous prime is 180617. The next prime is 180623. The reversal of 180621 is 126081.

It is not a de Polignac number, because 180621 - 2² = 180617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 180594 and 180603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 180621.

It is not an unprimeable number, because it can be changed into a prime (180623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2931 + ... + 2991.

It is an arithmetic number, because the mean of its divisors is an integer number (12896).

180621 is a Friedman number, since it can be written as 8601*21, using all its digits and the basic arithmetic operations.

2¹⁸⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

180621 is a deficient number, since it is larger than the sum of its proper divisors (128883).

180621 is a wasteful number, since it uses less digits than its factorization.

180621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 180621 is about 424.9952940916. The cubic root of 180621 is about 56.5270186904.

The spelling of 180621 in words is "one hundred eighty thousand, six hundred twenty-one".