18819481 has 8 divisors (see below), whose sum is σ = 19997280. Its totient is φ = 17660448.

The previous prime is 18819461. The next prime is 18819487. The reversal of 18819481 is 18491881.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18819481 is a prime.

It is a super-2 number, since 2×18819481² = 708345730218722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18819487) 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, 2596 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (2499660).

Almost surely, 2^18819481 is an apocalyptic number.

It is an amenable number.

18819481 is a deficient number, since it is larger than the sum of its proper divisors (1177799).

18819481 is a wasteful number, since it uses less digits than its factorization.

18819481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9383.

The product of its digits is 18432, while the sum is 40.

The square root of 18819481 is about 4338.1425748816. The cubic root of 18819481 is about 265.9923914759.

The spelling of 18819481 in words is "eighteen million, eight hundred nineteen thousand, four hundred eighty-one".