122639 has 4 divisors (see below), whose sum is σ = 133800. Its totient is φ = 111480.

The previous prime is 122611. The next prime is 122651. The reversal of 122639 is 936221.

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 122639 - 2¹² = 118543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122609) 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, 5564 + ... + 5585.

It is an arithmetic number, because the mean of its divisors is an integer number (33450).

2¹²²⁶³⁹ is an apocalyptic number.

122639 is a deficient number, since it is larger than the sum of its proper divisors (11161).

122639 is a wasteful number, since it uses less digits than its factorization.

122639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160.

The product of its digits is 648, while the sum is 23.

The square root of 122639 is about 350.1985151311. The cubic root of 122639 is about 49.6831969561.

The spelling of 122639 in words is "one hundred twenty-two thousand, six hundred thirty-nine".