18091412 has 6 divisors (see below), whose sum is σ = 31659978. Its totient is φ = 9045704.

The previous prime is 18091393. The next prime is 18091421. The reversal of 18091412 is 21419081.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 3083536 = 3874^2 + 1756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2261423 + ... + 2261430.

It is an arithmetic number, because the mean of its divisors is an integer number (5276663).

Almost surely, 2^18091412 is an apocalyptic number.

It is an amenable number.

18091412 is a deficient number, since it is larger than the sum of its proper divisors (13568566).

18091412 is a wasteful number, since it uses less digits than its factorization.

18091412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522857 (or 4522855 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18091412 is about 4253.4000517233. The cubic root of 18091412 is about 262.5170335130.

The spelling of 18091412 in words is "eighteen million, ninety-one thousand, four hundred twelve".