18973478 has 8 divisors (see below), whose sum is σ = 28503480. Its totient is φ = 9472320.

The previous prime is 18973469. The next prime is 18973481. The reversal of 18973478 is 87437981.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5483 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (3562935).

Almost surely, 2^18973478 is an apocalyptic number.

18973478 is a deficient number, since it is larger than the sum of its proper divisors (9530002).

18973478 is a wasteful number, since it uses less digits than its factorization.

18973478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422.

The product of its digits is 338688, while the sum is 47.

The square root of 18973478 is about 4355.8555990758. The cubic root of 18973478 is about 266.7159467952.

The spelling of 18973478 in words is "eighteen million, nine hundred seventy-three thousand, four hundred seventy-eight".