18783913 has 12 divisors (see below), whose sum is σ = 20173188. Its totient is φ = 17483040.

The previous prime is 18783911. The next prime is 18783943. The reversal of 18783913 is 31938781.

It can be written as a sum of positive squares in 2 ways, for example, as 831744 + 17952169 = 912^2 + 4237^2 .

It is not a de Polignac number, because 18783913 - 2¹ = 18783911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18783911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21595 + ... + 22447.

It is an arithmetic number, because the mean of its divisors is an integer number (1681099).

Almost surely, 2^18783913 is an apocalyptic number.

It is an amenable number.

18783913 is a deficient number, since it is larger than the sum of its proper divisors (1389275).

18783913 is an equidigital number, since it uses as much as digits as its factorization.

18783913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 933 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 18783913 is about 4334.0411857757. The cubic root of 18783913 is about 265.8247144497.

It can be divided in two parts, 187 and 83913, that added together give a square (84100 = 290²).

The spelling of 18783913 in words is "eighteen million, seven hundred eighty-three thousand, nine hundred thirteen".