18091356 has 12 divisors (see below), whose sum is σ = 42213192. Its totient is φ = 6030448.

The previous prime is 18091313. The next prime is 18091369. The reversal of 18091356 is 65319081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753795 + ... + 753818.

It is an arithmetic number, because the mean of its divisors is an integer number (3517766).

Almost surely, 2^18091356 is an apocalyptic number.

It is an amenable number.

18091356 is an abundant number, since it is smaller than the sum of its proper divisors (24121836).

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

18091356 is a wasteful number, since it uses less digits than its factorization.

18091356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507620 (or 1507618 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 18091356 is about 4253.3934687494. The cubic root of 18091356 is about 262.5167626484.

The spelling of 18091356 in words is "eighteen million, ninety-one thousand, three hundred fifty-six".