18981712 has 20 divisors (see below), whose sum is σ = 36911700. Its totient is φ = 9456128.

The previous prime is 18981691. The next prime is 18981713. The reversal of 18981712 is 21718981.

It can be written as a sum of positive squares in 2 ways, for example, as 12138256 + 6843456 = 3484^2 + 2616^2 .

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 3 ways as a sum of consecutive naturals, for example, 2664 + ... + 6712.

It is an arithmetic number, because the mean of its divisors is an integer number (1845585).

Almost surely, 2^18981712 is an apocalyptic number.

It is an amenable number.

18981712 is a deficient number, since it is larger than the sum of its proper divisors (17929988).

18981712 is a wasteful number, since it uses less digits than its factorization.

18981712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350 (or 4344 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 18981712 is about 4356.8006610356. The cubic root of 18981712 is about 266.7545238288.

The spelling of 18981712 in words is "eighteen million, nine hundred eighty-one thousand, seven hundred twelve".