18736722 has 12 divisors (see below), whose sum is σ = 40596270. Its totient is φ = 6245568.

The previous prime is 18736721. The next prime is 18736727. The reversal of 18736722 is 22763781.

It can be written as a sum of positive squares in only one way, i.e., 9790641 + 8946081 = 3129^2 + 2991^2 .

It is not an unprimeable number, because it can be changed into a prime (18736721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 520447 + ... + 520482.

Almost surely, 2^18736722 is an apocalyptic number.

18736722 is an abundant number, since it is smaller than the sum of its proper divisors (21859548).

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

18736722 is a wasteful number, since it uses less digits than its factorization.

18736722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040937 (or 1040934 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 18736722 is about 4328.5935360114. The cubic root of 18736722 is about 265.6019164623.

The spelling of 18736722 in words is "eighteen million, seven hundred thirty-six thousand, seven hundred twenty-two".