18731412 has 72 divisors (see below), whose sum is σ = 56137536. Its totient is φ = 5349888.

The previous prime is 18731411. The next prime is 18731417. The reversal of 18731412 is 21413781.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18731411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5428 + ... + 8180.

It is an arithmetic number, because the mean of its divisors is an integer number (779688).

Almost surely, 2^18731412 is an apocalyptic number.

18731412 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 18731412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28068768).

18731412 is an abundant number, since it is smaller than the sum of its proper divisors (37406124).

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

18731412 is a wasteful number, since it uses less digits than its factorization.

18731412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779 (or 2765 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18731412 is about 4327.9801293444. The cubic root of 18731412 is about 265.5768235026.

The spelling of 18731412 in words is "eighteen million, seven hundred thirty-one thousand, four hundred twelve".