123139356 has 12 divisors (see below), whose sum is σ = 287325192. Its totient is φ = 41046448.

The previous prime is 123139351. The next prime is 123139397. The reversal of 123139356 is 653931321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123139351) 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, 5130795 + ... + 5130818.

It is an arithmetic number, because the mean of its divisors is an integer number (23943766).

Almost surely, 2^123139356 is an apocalyptic number.

It is an amenable number.

123139356 is an abundant number, since it is smaller than the sum of its proper divisors (164185836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123139356 is a wasteful number, since it uses less digits than its factorization.

123139356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261620 (or 10261618 counting only the distinct ones).

The product of its digits is 14580, while the sum is 33.

The square root of 123139356 is about 11096.8173815739. The cubic root of 123139356 is about 497.5067292003.

The spelling of 123139356 in words is "one hundred twenty-three million, one hundred thirty-nine thousand, three hundred fifty-six".