18947712 has 192 divisors, whose sum is σ = 62791200. Its totient is φ = 5031936.

The previous prime is 18947711. The next prime is 18947713. The reversal of 18947712 is 21774981.

It is an interprime number because it is at equal distance from previous prime (18947711) and next prime (18947713).

It is a tau number, because it is divible by the number of its divisors (192).

Its product of digits (28224) is a multiple of the sum of its prime divisors (84).

It is not an unprimeable number, because it can be changed into a prime (18947711) 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, 357478 + ... + 357530.

Almost surely, 2^18947712 is an apocalyptic number.

18947712 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 18947712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31395600).

18947712 is an abundant number, since it is smaller than the sum of its proper divisors (43843488).

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

18947712 is a wasteful number, since it uses less digits than its factorization.

18947712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 84 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 18947712 is about 4352.8969663892. The cubic root of 18947712 is about 266.5951586042.

The spelling of 18947712 in words is "eighteen million, nine hundred forty-seven thousand, seven hundred twelve".