18051722 has 16 divisors (see below), whose sum is σ = 30876552. Its totient is φ = 7841280.

The previous prime is 18051707. The next prime is 18051727. The reversal of 18051722 is 22715081.

It can be written as a sum of positive squares in 4 ways, for example, as 17397241 + 654481 = 4171^2 + 809^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 18051691 and 18051700.

It is not an unprimeable number, because it can be changed into a prime (18051727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19979 + ... + 20862.

Almost surely, 2^18051722 is an apocalyptic number.

18051722 is a deficient number, since it is larger than the sum of its proper divisors (12824830).

18051722 is a wasteful number, since it uses less digits than its factorization.

18051722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40873.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18051722 is about 4248.7318107878. The cubic root of 18051722 is about 262.3249178681.

The spelling of 18051722 in words is "eighteen million, fifty-one thousand, seven hundred twenty-two".