183928921 has 16 divisors (see below), whose sum is σ = 211051008. Its totient is φ = 158745600.

The previous prime is 183928897. The next prime is 183928937. The reversal of 183928921 is 129829381.

183928921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 183928921 - 2¹⁹ = 183404633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (183928951) 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, 12985 + ... + 23161.

It is an arithmetic number, because the mean of its divisors is an integer number (13190688).

Almost surely, 2^183928921 is an apocalyptic number.

183928921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

183928921 is a deficient number, since it is larger than the sum of its proper divisors (27122087).

183928921 is a wasteful number, since it uses less digits than its factorization.

183928921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10272.

The product of its digits is 62208, while the sum is 43.

The square root of 183928921 is about 13562.0397064748. The cubic root of 183928921 is about 568.7001476894.

The spelling of 183928921 in words is "one hundred eighty-three million, nine hundred twenty-eight thousand, nine hundred twenty-one".