18947412 has 96 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 5587200.

The previous prime is 18947363. The next prime is 18947419. The reversal of 18947412 is 21474981.

18947412 is a `hidden beast` number, since 189 + 474 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48514 + ... + 48902.

It is an arithmetic number, because the mean of its divisors is an integer number (573300).

Almost surely, 2^18947412 is an apocalyptic number.

18947412 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 18947412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

18947412 is an abundant number, since it is smaller than the sum of its proper divisors (36089388).

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

18947412 is a wasteful number, since it uses less digits than its factorization.

18947412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 446 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18947412 is about 4352.8625064433. The cubic root of 18947412 is about 266.5937515923.

The spelling of 18947412 in words is "eighteen million, nine hundred forty-seven thousand, four hundred twelve".