18981716 has 48 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 8207232.

The previous prime is 18981713. The next prime is 18981727. The reversal of 18981716 is 61718981.

It is a super-5 number, since 5×18981716⁵ (a number of 38 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70430 + ... + 70698.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^18981716 is an apocalyptic number.

It is an amenable number.

18981716 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

18981716 is a wasteful number, since it uses less digits than its factorization.

18981716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its digits is 24192, while the sum is 41.

The square root of 18981716 is about 4356.8011200880. The cubic root of 18981716 is about 266.7545425664.

The spelling of 18981716 in words is "eighteen million, nine hundred eighty-one thousand, seven hundred sixteen".