18408982 has 4 divisors (see below), whose sum is σ = 27613476. Its totient is φ = 9204490.

The previous prime is 18408979. The next prime is 18408983. The reversal of 18408982 is 28980481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28980481 = 41 ⋅706841.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408983) 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 as a sum of consecutive naturals, namely, 4602244 + ... + 4602247.

It is an arithmetic number, because the mean of its divisors is an integer number (6903369).

Almost surely, 2^18408982 is an apocalyptic number.

18408982 is a deficient number, since it is larger than the sum of its proper divisors (9204494).

18408982 is an equidigital number, since it uses as much as digits as its factorization.

18408982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204493.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18408982 is about 4290.5689599399. The cubic root of 18408982 is about 264.0441749617.

The spelling of 18408982 in words is "eighteen million, four hundred eight thousand, nine hundred eighty-two".