18861612 has 96 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 4830720.

The previous prime is 18861593. The next prime is 18861637. The reversal of 18861612 is 21616881.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126514 + ... + 126662.

It is an arithmetic number, because the mean of its divisors is an integer number (579600).

Almost surely, 2^18861612 is an apocalyptic number.

18861612 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 18861612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27820800).

18861612 is an abundant number, since it is smaller than the sum of its proper divisors (36779988).

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

18861612 is a wasteful number, since it uses less digits than its factorization.

18861612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 309 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 18861612 is about 4342.9957402696. The cubic root of 18861612 is about 266.1907351175.

The spelling of 18861612 in words is "eighteen million, eight hundred sixty-one thousand, six hundred twelve".