180638421 has 4 divisors (see below), whose sum is σ = 240851232. Its totient is φ = 120425612.

The previous prime is 180638411. The next prime is 180638429. The reversal of 180638421 is 124836081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124836081 = 3 ⋅41612027.

It is a cyclic number.

It is not a de Polignac number, because 180638421 - 2⁶ = 180638357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180638429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30106401 + ... + 30106406.

It is an arithmetic number, because the mean of its divisors is an integer number (60212808).

Almost surely, 2^180638421 is an apocalyptic number.

It is an amenable number.

180638421 is a deficient number, since it is larger than the sum of its proper divisors (60212811).

180638421 is an equidigital number, since it uses as much as digits as its factorization.

180638421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60212810.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 180638421 is about 13440.1793514819. The cubic root of 180638421 is about 565.2883598657.

The spelling of 180638421 in words is "one hundred eighty million, six hundred thirty-eight thousand, four hundred twenty-one".