189393939 has 24 divisors (see below), whose sum is σ = 313144832. Its totient is φ = 108054000.

The previous prime is 189393917. The next prime is 189393943. The reversal of 189393939 is 939393981.

189393939 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 189393939 - 2⁵ = 189393907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189393979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45312 + ... + 49314.

Almost surely, 2^189393939 is an apocalyptic number.

189393939 is a deficient number, since it is larger than the sum of its proper divisors (123750893).

189393939 is a wasteful number, since it uses less digits than its factorization.

189393939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4767 (or 4764 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 189393939 is about 13762.0470497670. The cubic root of 189393939 is about 574.2777967541.

The spelling of 189393939 in words is "one hundred eighty-nine million, three hundred ninety-three thousand, nine hundred thirty-nine".