18349791 has 16 divisors (see below), whose sum is σ = 25886976. Its totient is φ = 11537856.

The previous prime is 18349757. The next prime is 18349829. The reversal of 18349791 is 19794381.

It is a happy number.

It is not a de Polignac number, because 18349791 - 2¹⁰ = 18348767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18349741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3216 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (1617936).

Almost surely, 2^18349791 is an apocalyptic number.

18349791 is a deficient number, since it is larger than the sum of its proper divisors (7537185).

18349791 is a wasteful number, since it uses less digits than its factorization.

18349791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742.

The product of its digits is 54432, while the sum is 42.

The square root of 18349791 is about 4283.6656031955. The cubic root of 18349791 is about 263.7608744945.

The spelling of 18349791 in words is "eighteen million, three hundred forty-nine thousand, seven hundred ninety-one".