18013722 has 16 divisors (see below), whose sum is σ = 36122112. Its totient is φ = 5988800.

The previous prime is 18013711. The next prime is 18013741. The reversal of 18013722 is 22731081.

It is a junction number, because it is equal to n+sod(n) for n = 18013692 and 18013701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338 + ... + 6149.

It is an arithmetic number, because the mean of its divisors is an integer number (2257632).

Almost surely, 2^18013722 is an apocalyptic number.

18013722 is an abundant number, since it is smaller than the sum of its proper divisors (18108390).

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

18013722 is a wasteful number, since it uses less digits than its factorization.

18013722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7893.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18013722 is about 4244.2575322428. The cubic root of 18013722 is about 262.1407184560.

The spelling of 18013722 in words is "eighteen million, thirteen thousand, seven hundred twenty-two".