122139 has 12 divisors (see below), whose sum is σ = 181272. Its totient is φ = 79200.

The previous prime is 122131. The next prime is 122147. The reversal of 122139 is 931221.

It is a happy number.

122139 is nontrivially palindromic in base 14.

It is an interprime number because it is at equal distance from previous prime (122131) and next prime (122147).

It is not a de Polignac number, because 122139 - 2³ = 122131 is a prime.

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 122139.

It is not an unprimeable number, because it can be changed into a prime (122131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204 + ... + 534.

It is an arithmetic number, because the mean of its divisors is an integer number (15106).

2¹²²¹³⁹ is an apocalyptic number.

122139 is a deficient number, since it is larger than the sum of its proper divisors (59133).

122139 is a wasteful number, since it uses less digits than its factorization.

122139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 375 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 122139 is about 349.4839052088. The cubic root of 122139 is about 49.6155854161.

The spelling of 122139 in words is "one hundred twenty-two thousand, one hundred thirty-nine".