188830921 has 2 divisors, whose sum is σ = 188830922. Its totient is φ = 188830920.

The previous prime is 188830879. The next prime is 188830927. The reversal of 188830921 is 129038881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165405321 + 23425600 = 12861^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 188830921 - 2¹⁹ = 188306633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188830927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94415460 + 94415461.

It is an arithmetic number, because the mean of its divisors is an integer number (94415461).

Almost surely, 2^188830921 is an apocalyptic number.

It is an amenable number.

188830921 is a deficient number, since it is larger than the sum of its proper divisors (1).

188830921 is an equidigital number, since it uses as much as digits as its factorization.

188830921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 188830921 is about 13741.5763651773. The cubic root of 188830921 is about 573.7081733566.

The spelling of 188830921 in words is "one hundred eighty-eight million, eight hundred thirty thousand, nine hundred twenty-one".