18748819 has 8 divisors (see below), whose sum is σ = 19530000. Its totient is φ = 17976672.

The previous prime is 18748813. The next prime is 18748823. The reversal of 18748819 is 91884781.

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

It is a cyclic number.

It is not a de Polignac number, because 18748819 - 2¹³ = 18740627 is a prime.

It is a super-2 number, since 2×18748819² = 703036427789522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18748813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2152 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (2441250).

Almost surely, 2^18748819 is an apocalyptic number.

18748819 is a deficient number, since it is larger than the sum of its proper divisors (781181).

18748819 is a wasteful number, since it uses less digits than its factorization.

18748819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517.

The product of its digits is 129024, while the sum is 46.

The square root of 18748819 is about 4329.9906466412. The cubic root of 18748819 is about 265.6590644018.

The spelling of 18748819 in words is "eighteen million, seven hundred forty-eight thousand, eight hundred nineteen".