18813047 has 8 divisors (see below), whose sum is σ = 20589312. Its totient is φ = 17047800.

The previous prime is 18813043. The next prime is 18813077. The reversal of 18813047 is 74031881.

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

It is not a de Polignac number, because 18813047 - 2² = 18813043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18813043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1058 + ... + 6224.

It is an arithmetic number, because the mean of its divisors is an integer number (2573664).

Almost surely, 2^18813047 is an apocalyptic number.

18813047 is a deficient number, since it is larger than the sum of its proper divisors (1776265).

18813047 is a wasteful number, since it uses less digits than its factorization.

18813047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5509.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18813047 is about 4337.4009498777. The cubic root of 18813047 is about 265.9620755475.

The spelling of 18813047 in words is "eighteen million, eight hundred thirteen thousand, forty-seven".