18481716 has 96 divisors (see below), whose sum is σ = 53544960. Its totient is φ = 5464800.

The previous prime is 18481709. The next prime is 18481721. The reversal of 18481716 is 61718481.

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

It is a congruent number.

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, 55671 + ... + 56001.

It is an arithmetic number, because the mean of its divisors is an integer number (557760).

Almost surely, 2^18481716 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 18481716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26772480).

18481716 is an abundant number, since it is smaller than the sum of its proper divisors (35063244).

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

18481716 is a wasteful number, since it uses less digits than its factorization.

18481716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 394 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 18481716 is about 4299.0366362710. The cubic root of 18481716 is about 264.3914646956.

The spelling of 18481716 in words is "eighteen million, four hundred eighty-one thousand, seven hundred sixteen".