188073921 has 32 divisors (see below), whose sum is σ = 300146688. Its totient is φ = 102421440.

The previous prime is 188073889. The next prime is 188073943. The reversal of 188073921 is 129370881.

It is not a de Polignac number, because 188073921 - 2⁵ = 188073889 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 188073921.

It is not an unprimeable number, because it can be changed into a prime (188073121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176731 + ... + 177791.

It is an arithmetic number, because the mean of its divisors is an integer number (9379584).

Almost surely, 2^188073921 is an apocalyptic number.

It is an amenable number.

188073921 is a deficient number, since it is larger than the sum of its proper divisors (112072767).

188073921 is a wasteful number, since it uses less digits than its factorization.

188073921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 188073921 is about 13714.0045573859. The cubic root of 188073921 is about 572.9405047127.

The spelling of 188073921 in words is "one hundred eighty-eight million, seventy-three thousand, nine hundred twenty-one".