18223478 has 16 divisors (see below), whose sum is σ = 33643680. Its totient is φ = 7209216.

The previous prime is 18223463. The next prime is 18223547. The reversal of 18223478 is 87432281.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 49883 + ... + 50246.

It is an arithmetic number, because the mean of its divisors is an integer number (2102730).

Almost surely, 2^18223478 is an apocalyptic number.

18223478 is a deficient number, since it is larger than the sum of its proper divisors (15420202).

18223478 is a wasteful number, since it uses less digits than its factorization.

18223478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100151.

The product of its digits is 21504, while the sum is 35.

The square root of 18223478 is about 4268.8965787426. The cubic root of 18223478 is about 263.1542705480.

The spelling of 18223478 in words is "eighteen million, two hundred twenty-three thousand, four hundred seventy-eight".