189649139 has 4 divisors (see below), whose sum is σ = 189722256. Its totient is φ = 189576024.

The previous prime is 189649073. The next prime is 189649151. The reversal of 189649139 is 931946981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189649139 - 2⁸ = 189648883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189649169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32519 + ... + 37904.

It is an arithmetic number, because the mean of its divisors is an integer number (47430564).

Almost surely, 2^189649139 is an apocalyptic number.

189649139 is a deficient number, since it is larger than the sum of its proper divisors (73117).

189649139 is an equidigital number, since it uses as much as digits as its factorization.

189649139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73116.

The product of its digits is 419904, while the sum is 50.

The square root of 189649139 is about 13771.3158049621. The cubic root of 189649139 is about 574.5356190088.

The spelling of 189649139 in words is "one hundred eighty-nine million, six hundred forty-nine thousand, one hundred thirty-nine".