18806219 has 8 divisors (see below), whose sum is σ = 19894080. Its totient is φ = 17728200.

The previous prime is 18806209. The next prime is 18806237. The reversal of 18806219 is 91260881.

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 18806219 - 2¹² = 18802123 is a prime.

It is a super-2 number, since 2×18806219² = 707347746151922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18806209) 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, 1664 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (2486760).

Almost surely, 2^18806219 is an apocalyptic number.

18806219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18806219 is a deficient number, since it is larger than the sum of its proper divisors (1087861).

18806219 is a wasteful number, since it uses less digits than its factorization.

18806219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18806219 is about 4336.6137711353. The cubic root of 18806219 is about 265.9298955965.

The spelling of 18806219 in words is "eighteen million, eight hundred six thousand, two hundred nineteen".