18041391 has 12 divisors (see below), whose sum is σ = 26130000. Its totient is φ = 11995200.

The previous prime is 18041383. The next prime is 18041449. The reversal of 18041391 is 19314081.

It is not a de Polignac number, because 18041391 - 2³ = 18041383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18041351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110 + ... + 6108.

It is an arithmetic number, because the mean of its divisors is an integer number (2177500).

Almost surely, 2^18041391 is an apocalyptic number.

18041391 is a deficient number, since it is larger than the sum of its proper divisors (8088609).

18041391 is a wasteful number, since it uses less digits than its factorization.

18041391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406 (or 5403 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18041391 is about 4247.5158622423. The cubic root of 18041391 is about 262.2748654708.

The spelling of 18041391 in words is "eighteen million, forty-one thousand, three hundred ninety-one".