189499939 has 8 divisors (see below), whose sum is σ = 200480000. Its totient is φ = 178620552.

The previous prime is 189499883. The next prime is 189499943. The reversal of 189499939 is 939994981.

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 189499939 - 2⁷ = 189499811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189499039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21279 + ... + 28840.

It is an arithmetic number, because the mean of its divisors is an integer number (25060000).

Almost surely, 2^189499939 is an apocalyptic number.

189499939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

189499939 is a deficient number, since it is larger than the sum of its proper divisors (10980061).

189499939 is a wasteful number, since it uses less digits than its factorization.

189499939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50337.

The product of its digits is 5668704, while the sum is 61.

The square root of 189499939 is about 13765.8976823163. The cubic root of 189499939 is about 574.3849140387.

The spelling of 189499939 in words is "one hundred eighty-nine million, four hundred ninety-nine thousand, nine hundred thirty-nine".