189209915 has 8 divisors (see below), whose sum is σ = 240408000. Its totient is φ = 142463872.

The previous prime is 189209903. The next prime is 189209929. The reversal of 189209915 is 519902981.

It is a happy number.

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 189209915 - 2⁴ = 189209899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112915 + ... + 1113084.

It is an arithmetic number, because the mean of its divisors is an integer number (30051000).

Almost surely, 2^189209915 is an apocalyptic number.

189209915 is a deficient number, since it is larger than the sum of its proper divisors (51198085).

189209915 is a wasteful number, since it uses less digits than its factorization.

189209915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226021.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 189209915 is about 13755.3595009364. The cubic root of 189209915 is about 574.0917381004.

The spelling of 189209915 in words is "one hundred eighty-nine million, two hundred nine thousand, nine hundred fifteen".