189306639 has 10 divisors (see below), whose sum is σ = 282791520. Its totient is φ = 126204372.

The previous prime is 189306631. The next prime is 189306643. The reversal of 189306639 is 936603981.

189306639 is a `hidden beast` number, since 1 + 8 + 9 + 3 + 0 + 6 + 639 = 666.

189306639 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 189306639 - 2³ = 189306631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189306594 and 189306603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189306631) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1168479 + ... + 1168640.

It is an arithmetic number, because the mean of its divisors is an integer number (28279152).

Almost surely, 2^189306639 is an apocalyptic number.

189306639 is a deficient number, since it is larger than the sum of its proper divisors (93484881).

189306639 is an equidigital number, since it uses as much as digits as its factorization.

189306639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337131 (or 2337122 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 189306639 is about 13758.8749176668. The cubic root of 189306639 is about 574.1895465581.

The spelling of 189306639 in words is "one hundred eighty-nine million, three hundred six thousand, six hundred thirty-nine".