18781463 has 4 divisors (see below), whose sum is σ = 18953880. Its totient is φ = 18609048.

The previous prime is 18781457. The next prime is 18781471. The reversal of 18781463 is 36418781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18781463 - 2¹⁶ = 18715927 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 (18781423) 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 3 ways as a sum of consecutive naturals, for example, 86045 + ... + 86262.

It is an arithmetic number, because the mean of its divisors is an integer number (4738470).

Almost surely, 2^18781463 is an apocalyptic number.

18781463 is a deficient number, since it is larger than the sum of its proper divisors (172417).

18781463 is a wasteful number, since it uses less digits than its factorization.

18781463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172416.

The product of its digits is 32256, while the sum is 38.

The square root of 18781463 is about 4333.7585304214. The cubic root of 18781463 is about 265.8131567076.

The spelling of 18781463 in words is "eighteen million, seven hundred eighty-one thousand, four hundred sixty-three".