18040349 has 32 divisors (see below), whose sum is σ = 21669120. Its totient is φ = 14902272.

The previous prime is 18040333. The next prime is 18040387. The reversal of 18040349 is 94304081.

It is a cyclic number.

It is not a de Polignac number, because 18040349 - 2⁴ = 18040333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419522 + ... + 419564.

It is an arithmetic number, because the mean of its divisors is an integer number (677160).

Almost surely, 2^18040349 is an apocalyptic number.

It is an amenable number.

18040349 is a deficient number, since it is larger than the sum of its proper divisors (3628771).

18040349 is a wasteful number, since it uses less digits than its factorization.

18040349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18040349 is about 4247.3932005408. The cubic root of 18040349 is about 262.2698160510.

The spelling of 18040349 in words is "eighteen million, forty thousand, three hundred forty-nine".