123155712 has 54 divisors (see below), whose sum is σ = 355094922. Its totient is φ = 41051136.

The previous prime is 123155693. The next prime is 123155713. The reversal of 123155712 is 217551321.

It can be written as a sum of positive squares in only one way, i.e., 109495296 + 13660416 = 10464^2 + 3696^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123155713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24423 + ... + 29030.

Almost surely, 2^123155712 is an apocalyptic number.

123155712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123155712 is an abundant number, since it is smaller than the sum of its proper divisors (231939210).

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

123155712 is an equidigital number, since it uses as much as digits as its factorization.

123155712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53475 (or 53458 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 123155712 is about 11097.5543251655. The cubic root of 123155712 is about 497.5287553558.

The spelling of 123155712 in words is "one hundred twenty-three million, one hundred fifty-five thousand, seven hundred twelve".