18340091 has 24 divisors (see below), whose sum is σ = 23493120. Its totient is φ = 14010480.

The previous prime is 18340061. The next prime is 18340139. The reversal of 18340091 is 19004381.

It is not a de Polignac number, because 18340091 - 2¹⁴ = 18323707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18340091.

It is not an unprimeable number, because it can be changed into a prime (18340051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49790 + ... + 50156.

It is an arithmetic number, because the mean of its divisors is an integer number (978880).

Almost surely, 2^18340091 is an apocalyptic number.

18340091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18340091 is a deficient number, since it is larger than the sum of its proper divisors (5153029).

18340091 is a wasteful number, since it uses less digits than its factorization.

18340091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18340091 is about 4282.5332456386. The cubic root of 18340091 is about 263.7143901970.

The spelling of 18340091 in words is "eighteen million, three hundred forty thousand, ninety-one".