190866721 has 8 divisors (see below), whose sum is σ = 197733888. Its totient is φ = 184044000.

The previous prime is 190866713. The next prime is 190866733. The reversal of 190866721 is 127668091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 190866721 - 2³ = 190866713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190866751) 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 7 ways as a sum of consecutive naturals, for example, 2245 + ... + 19666.

It is an arithmetic number, because the mean of its divisors is an integer number (24716736).

Almost surely, 2^190866721 is an apocalyptic number.

It is an amenable number.

190866721 is a deficient number, since it is larger than the sum of its proper divisors (6867167).

190866721 is a wasteful number, since it uses less digits than its factorization.

190866721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22223.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 190866721 is about 13815.4522546314. The cubic root of 190866721 is about 575.7625381530.

The spelling of 190866721 in words is "one hundred ninety million, eight hundred sixty-six thousand, seven hundred twenty-one".