189686021 has 8 divisors (see below), whose sum is σ = 216969984. Its totient is φ = 162448560.

The previous prime is 189685973. The next prime is 189686033. The reversal of 189686021 is 120686981.

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 189686021 - 2⁶ = 189685957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189686021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189686041) 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, 2390 + ... + 19623.

It is an arithmetic number, because the mean of its divisors is an integer number (27121248).

Almost surely, 2^189686021 is an apocalyptic number.

It is an amenable number.

189686021 is a deficient number, since it is larger than the sum of its proper divisors (27283963).

189686021 is a wasteful number, since it uses less digits than its factorization.

189686021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23251.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 189686021 is about 13772.6548275922. The cubic root of 189686021 is about 574.5728608498.

The spelling of 189686021 in words is "one hundred eighty-nine million, six hundred eighty-six thousand, twenty-one".