18827969 has 4 divisors (see below), whose sum is σ = 19054896. Its totient is φ = 18601044.

The previous prime is 18827957. The next prime is 18827971. The reversal of 18827969 is 96972881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18827969 - 2¹² = 18823873 is a prime.

It is a super-2 number, since 2×18827969² = 708984833329922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18827909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113339 + ... + 113504.

It is an arithmetic number, because the mean of its divisors is an integer number (4763724).

Almost surely, 2^18827969 is an apocalyptic number.

It is an amenable number.

18827969 is a deficient number, since it is larger than the sum of its proper divisors (226927).

18827969 is an equidigital number, since it uses as much as digits as its factorization.

18827969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226926.

The product of its digits is 435456, while the sum is 50.

The square root of 18827969 is about 4339.1207634727. The cubic root of 18827969 is about 266.0323749390.

The spelling of 18827969 in words is "eighteen million, eight hundred twenty-seven thousand, nine hundred sixty-nine".