180421813 has 16 divisors (see below), whose sum is σ = 212587200. Its totient is φ = 150958080.

The previous prime is 180421807. The next prime is 180421837. The reversal of 180421813 is 318124081.

It is not a de Polignac number, because 180421813 - 2⁹ = 180421301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180421883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52533 + ... + 55861.

It is an arithmetic number, because the mean of its divisors is an integer number (13286700).

Almost surely, 2^180421813 is an apocalyptic number.

180421813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

180421813 is a deficient number, since it is larger than the sum of its proper divisors (32165387).

180421813 is a wasteful number, since it uses less digits than its factorization.

180421813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 180421813 is about 13432.1187085285. The cubic root of 180421813 is about 565.0623190717.

Adding to 180421813 its reverse (318124081), we get a palindrome (498545894).

The spelling of 180421813 in words is "one hundred eighty million, four hundred twenty-one thousand, eight hundred thirteen".