189502721 has 8 divisors (see below), whose sum is σ = 195815424. Its totient is φ = 183202560.

The previous prime is 189502717. The next prime is 189502739. The reversal of 189502721 is 127205981.

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

It is not a de Polignac number, because 189502721 - 2² = 189502717 is a prime.

It is a super-2 number, since 2×189502721² = 71822562532807682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189502711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35216 + ... + 40238.

It is an arithmetic number, because the mean of its divisors is an integer number (24476928).

Almost surely, 2^189502721 is an apocalyptic number.

It is an amenable number.

189502721 is a deficient number, since it is larger than the sum of its proper divisors (6312703).

189502721 is a wasteful number, since it uses less digits than its factorization.

189502721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 189502721 is about 13765.9987287519. The cubic root of 189502721 is about 574.3877248242.

Adding to 189502721 its sum of digits (35), we get a square (189502756 = 13766²).

The spelling of 189502721 in words is "one hundred eighty-nine million, five hundred two thousand, seven hundred twenty-one".