189499639 has 8 divisors (see below), whose sum is σ = 219621888. Its totient is φ = 160140120.

The previous prime is 189499637. The next prime is 189499649. The reversal of 189499639 is 936994981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189499639 - 2¹ = 189499637 is a prime.

It is a super-2 number, since 2×189499639² = 71820226362260642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189499637) 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, 190147 + ... + 191140.

It is an arithmetic number, because the mean of its divisors is an integer number (27452736).

Almost surely, 2^189499639 is an apocalyptic number.

189499639 is a deficient number, since it is larger than the sum of its proper divisors (30122249).

189499639 is an equidigital number, since it uses as much as digits as its factorization.

189499639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381365.

The product of its digits is 3779136, while the sum is 58.

The square root of 189499639 is about 13765.8867858195. The cubic root of 189499639 is about 574.3846109330.

The spelling of 189499639 in words is "one hundred eighty-nine million, four hundred ninety-nine thousand, six hundred thirty-nine".