18742258 has 8 divisors (see below), whose sum is σ = 28240128. Its totient is φ = 9328884.

The previous prime is 18742253. The next prime is 18742261. The reversal of 18742258 is 85224781.

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

It is not an unprimeable number, because it can be changed into a prime (18742253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20566 + ... + 21457.

It is an arithmetic number, because the mean of its divisors is an integer number (3530016).

Almost surely, 2^18742258 is an apocalyptic number.

18742258 is a deficient number, since it is larger than the sum of its proper divisors (9497870).

18742258 is a wasteful number, since it uses less digits than its factorization.

18742258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42248.

The product of its digits is 35840, while the sum is 37.

The square root of 18742258 is about 4329.2329574649. The cubic root of 18742258 is about 265.6280723612.

The spelling of 18742258 in words is "eighteen million, seven hundred forty-two thousand, two hundred fifty-eight".