18996478 has 12 divisors (see below), whose sum is σ = 28772928. Its totient is φ = 9406140.

The previous prime is 18996473. The next prime is 18996539. The reversal of 18996478 is 87469981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18996473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85075 + ... + 85297.

It is an arithmetic number, because the mean of its divisors is an integer number (2397744).

Almost surely, 2^18996478 is an apocalyptic number.

18996478 is a deficient number, since it is larger than the sum of its proper divisors (9776450).

18996478 is an equidigital number, since it uses as much as digits as its factorization.

18996478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 416 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 18996478 is about 4358.4949237093. The cubic root of 18996478 is about 266.8236759400.

The spelling of 18996478 in words is "eighteen million, nine hundred ninety-six thousand, four hundred seventy-eight".