189021215 has 16 divisors (see below), whose sum is σ = 252810720. Its totient is φ = 134830080.

The previous prime is 189021211. The next prime is 189021233. The reversal of 189021215 is 512120981.

189021215 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 189021215 - 2² = 189021211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189021211) 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, 56906 + ... + 60135.

It is an arithmetic number, because the mean of its divisors is an integer number (15800670).

Almost surely, 2^189021215 is an apocalyptic number.

189021215 is a deficient number, since it is larger than the sum of its proper divisors (63789505).

189021215 is a wasteful number, since it uses less digits than its factorization.

189021215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117082.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 189021215 is about 13748.4986453067. The cubic root of 189021215 is about 573.9008264278.

The spelling of 189021215 in words is "one hundred eighty-nine million, twenty-one thousand, two hundred fifteen".