123135312 has 20 divisors (see below), whose sum is σ = 318099680. Its totient is φ = 41045088.

The previous prime is 123135293. The next prime is 123135319. The reversal of 123135312 is 213531321.

It is a super-2 number, since 2×123135312² = 30324610122674688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123135319) 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, 1282612 + ... + 1282707.

It is an arithmetic number, because the mean of its divisors is an integer number (15904984).

Almost surely, 2^123135312 is an apocalyptic number.

123135312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123135312 is an abundant number, since it is smaller than the sum of its proper divisors (194964368).

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

123135312 is a wasteful number, since it uses less digits than its factorization.

123135312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565330 (or 2565324 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 123135312 is about 11096.6351656707. The cubic root of 123135312 is about 497.5012829609.

Adding to 123135312 its reverse (213531321), we get a palindrome (336666633).

The spelling of 123135312 in words is "one hundred twenty-three million, one hundred thirty-five thousand, three hundred twelve".