18421474 has 8 divisors (see below), whose sum is σ = 27716688. Its totient is φ = 9182580.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421474 is 47412481.

It is a happy number.

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

It is an unprimeable number.

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, 13252 + ... + 14575.

It is an arithmetic number, because the mean of its divisors is an integer number (3464586).

Almost surely, 2^18421474 is an apocalyptic number.

18421474 is a deficient number, since it is larger than the sum of its proper divisors (9295214).

18421474 is a wasteful number, since it uses less digits than its factorization.

18421474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28160.

The product of its digits is 7168, while the sum is 31.

The square root of 18421474 is about 4292.0244640496. The cubic root of 18421474 is about 264.1038866471.

The spelling of 18421474 in words is "eighteen million, four hundred twenty-one thousand, four hundred seventy-four".