18418749 has 16 divisors (see below), whose sum is σ = 25496064. Its totient is φ = 11818800.

The previous prime is 18418739. The next prime is 18418759. The reversal of 18418749 is 94781481.

It is an interprime number because it is at equal distance from previous prime (18418739) and next prime (18418759).

It is not a de Polignac number, because 18418749 - 2⁹ = 18418237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18418749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418709) 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 15 ways as a sum of consecutive naturals, for example, 8154 + ... + 10164.

It is an arithmetic number, because the mean of its divisors is an integer number (1593504).

Almost surely, 2^18418749 is an apocalyptic number.

It is an amenable number.

18418749 is a deficient number, since it is larger than the sum of its proper divisors (7077315).

18418749 is a wasteful number, since it uses less digits than its factorization.

18418749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128.

The product of its digits is 64512, while the sum is 42.

The square root of 18418749 is about 4291.7070030467. The cubic root of 18418749 is about 264.0908634659.

The spelling of 18418749 in words is "eighteen million, four hundred eighteen thousand, seven hundred forty-nine".