18947316 has 48 divisors (see below), whose sum is σ = 47234880. Its totient is φ = 5890560.

The previous prime is 18947311. The next prime is 18947321. The reversal of 18947316 is 61374981.

It is an interprime number because it is at equal distance from previous prime (18947311) and next prime (18947321).

Its product of digits (36288) is a multiple of the sum of its prime factors (864).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26370 + ... + 27078.

It is an arithmetic number, because the mean of its divisors is an integer number (984060).

Almost surely, 2^18947316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18947316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23617440).

18947316 is an abundant number, since it is smaller than the sum of its proper divisors (28287564).

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

18947316 is a wasteful number, since it uses less digits than its factorization.

18947316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 862 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 18947316 is about 4352.8514792030. The cubic root of 18947316 is about 266.5933013454.

The spelling of 18947316 in words is "eighteen million, nine hundred forty-seven thousand, three hundred sixteen".