123115212 has 72 divisors (see below), whose sum is σ = 357389760. Its totient is φ = 35341920.

The previous prime is 123115171. The next prime is 123115271. The reversal of 123115212 is 212511321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 658 + ... + 15705.

Almost surely, 2^123115212 is an apocalyptic number.

123115212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123115212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178694880).

123115212 is an abundant number, since it is smaller than the sum of its proper divisors (234274548).

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

123115212 is a wasteful number, since it uses less digits than its factorization.

123115212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16403 (or 16398 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 123115212 is about 11095.7294487564. The cubic root of 123115212 is about 497.4742116040.

Adding to 123115212 its reverse (212511321), we get a palindrome (335626533).

The spelling of 123115212 in words is "one hundred twenty-three million, one hundred fifteen thousand, two hundred twelve".