18947854 has 8 divisors (see below), whose sum is σ = 28566648. Its totient is φ = 9425640.

The previous prime is 18947849. The next prime is 18947857. The reversal of 18947854 is 45874981.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947857) by changing a digit.

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, 23652 + ... + 24439.

It is an arithmetic number, because the mean of its divisors is an integer number (3570831).

Almost surely, 2^18947854 is an apocalyptic number.

18947854 is a deficient number, since it is larger than the sum of its proper divisors (9618794).

18947854 is a wasteful number, since it uses less digits than its factorization.

18947854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48290.

The product of its digits is 322560, while the sum is 46.

The square root of 18947854 is about 4352.9132773351. The cubic root of 18947854 is about 266.5958245847.

The spelling of 18947854 in words is "eighteen million, nine hundred forty-seven thousand, eight hundred fifty-four".