18812481 has 8 divisors (see below), whose sum is σ = 25695264. Its totient is φ = 12235680.

The previous prime is 18812477. The next prime is 18812483. The reversal of 18812481 is 18421881.

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

It is not a de Polignac number, because 18812481 - 2² = 18812477 is a prime.

It is a super-2 number, since 2×18812481² = 707818882750722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18812483) 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 7 ways as a sum of consecutive naturals, for example, 76351 + ... + 76596.

It is an arithmetic number, because the mean of its divisors is an integer number (3211908).

Almost surely, 2^18812481 is an apocalyptic number.

It is an amenable number.

18812481 is a deficient number, since it is larger than the sum of its proper divisors (6882783).

18812481 is a wasteful number, since it uses less digits than its factorization.

18812481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152991.

The product of its digits is 4096, while the sum is 33.

The square root of 18812481 is about 4337.3357029402. The cubic root of 18812481 is about 265.9594083197.

The spelling of 18812481 in words is "eighteen million, eight hundred twelve thousand, four hundred eighty-one".