18840312 has 96 divisors (see below), whose sum is σ = 55111680. Its totient is φ = 5797440.

The previous prime is 18840307. The next prime is 18840331. The reversal of 18840312 is 21304881.

It is a congruent number.

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, 51153 + ... + 51519.

It is an arithmetic number, because the mean of its divisors is an integer number (574080).

Almost surely, 2^18840312 is an apocalyptic number.

18840312 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 18840312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27555840).

18840312 is an abundant number, since it is smaller than the sum of its proper divisors (36271368).

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

18840312 is a wasteful number, since it uses less digits than its factorization.

18840312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18840312 is about 4340.5428231962. The cubic root of 18840312 is about 266.0904962782.

The spelling of 18840312 in words is "eighteen million, eight hundred forty thousand, three hundred twelve".