18408742 has 8 divisors (see below), whose sum is σ = 30123432. Its totient is φ = 8367600.

The previous prime is 18408737. The next prime is 18408749. The reversal of 18408742 is 24780481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18408698 and 18408707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408749) 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 3 ways as a sum of consecutive naturals, for example, 418359 + ... + 418402.

It is an arithmetic number, because the mean of its divisors is an integer number (3765429).

Almost surely, 2^18408742 is an apocalyptic number.

18408742 is a deficient number, since it is larger than the sum of its proper divisors (11714690).

18408742 is a wasteful number, since it uses less digits than its factorization.

18408742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836774.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 18408742 is about 4290.5409915301. The cubic root of 18408742 is about 264.0430274987.

The spelling of 18408742 in words is "eighteen million, four hundred eight thousand, seven hundred forty-two".