123511812 has 72 divisors (see below), whose sum is σ = 310652160. Its totient is φ = 38109120.

The previous prime is 123511769. The next prime is 123511823. The reversal of 123511812 is 218115321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1154263 + ... + 1154369.

Almost surely, 2^123511812 is an apocalyptic number.

123511812 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 123511812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155326080).

123511812 is an abundant number, since it is smaller than the sum of its proper divisors (187140348).

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

123511812 is a wasteful number, since it uses less digits than its factorization.

123511812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 172 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 123511812 is about 11113.5868197446. The cubic root of 123511812 is about 498.0078223316.

The spelling of 123511812 in words is "one hundred twenty-three million, five hundred eleven thousand, eight hundred twelve".