168992139 has 16 divisors (see below), whose sum is σ = 230558720. Its totient is φ = 110073600.

The previous prime is 168992101. The next prime is 168992147. The reversal of 168992139 is 931299861.

It is not a de Polignac number, because 168992139 - 2¹¹ = 168990091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168992179) 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 15 ways as a sum of consecutive naturals, for example, 19314 + ... + 26664.

It is an arithmetic number, because the mean of its divisors is an integer number (14409920).

Almost surely, 2^168992139 is an apocalyptic number.

168992139 is a deficient number, since it is larger than the sum of its proper divisors (61566581).

168992139 is an equidigital number, since it uses as much as digits as its factorization.

168992139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530.

The product of its digits is 209952, while the sum is 48.

The square root of 168992139 is about 12999.6976503302. The cubic root of 168992139 is about 552.8689089078.

The spelling of 168992139 in words is "one hundred sixty-eight million, nine hundred ninety-two thousand, one hundred thirty-nine".