18969219 has 12 divisors (see below), whose sum is σ = 28345200. Its totient is φ = 12209904.

The previous prime is 18969169. The next prime is 18969221. The reversal of 18969219 is 91296981.

It is not a de Polignac number, because 18969219 - 2⁷ = 18969091 is a prime.

It is a super-2 number, since 2×18969219² = 719662538939922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18969259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36079 + ... + 36600.

It is an arithmetic number, because the mean of its divisors is an integer number (2362100).

Almost surely, 2^18969219 is an apocalyptic number.

18969219 is a deficient number, since it is larger than the sum of its proper divisors (9375981).

18969219 is a wasteful number, since it uses less digits than its factorization.

18969219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72714 (or 72711 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 18969219 is about 4355.3666894993. The cubic root of 18969219 is about 266.6959886160.

The spelling of 18969219 in words is "eighteen million, nine hundred sixty-nine thousand, two hundred nineteen".