18947434 has 16 divisors (see below), whose sum is σ = 31727520. Its totient is φ = 8411760.

The previous prime is 18947429. The next prime is 18947449. The reversal of 18947434 is 43474981.

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

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, 9069 + ... + 10960.

It is an arithmetic number, because the mean of its divisors is an integer number (1982970).

Almost surely, 2^18947434 is an apocalyptic number.

18947434 is a deficient number, since it is larger than the sum of its proper divisors (12780086).

18947434 is a wasteful number, since it uses less digits than its factorization.

18947434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20085.

The product of its digits is 96768, while the sum is 40.

The square root of 18947434 is about 4352.8650335153. The cubic root of 18947434 is about 266.5938547737.

The spelling of 18947434 in words is "eighteen million, nine hundred forty-seven thousand, four hundred thirty-four".