18081722 has 4 divisors (see below), whose sum is σ = 27122586. Its totient is φ = 9040860.

The previous prime is 18081691. The next prime is 18081733. The reversal of 18081722 is 22718081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22718081 = 1283 ⋅17707.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 6255001 = 3439^2 + 2501^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4520429 + ... + 4520432.

Almost surely, 2^18081722 is an apocalyptic number.

18081722 is a deficient number, since it is larger than the sum of its proper divisors (9040864).

18081722 is an equidigital number, since it uses as much as digits as its factorization.

18081722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040863.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18081722 is about 4252.2608104395. The cubic root of 18081722 is about 262.4701559420.

The spelling of 18081722 in words is "eighteen million, eighty-one thousand, seven hundred twenty-two".