23218019 has 8 divisors (see below), whose sum is σ = 26662080. Its totient is φ = 19996200.

The previous prime is 23218001. The next prime is 23218043. The reversal of 23218019 is 91081232.

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 23218019 - 2²⁴ = 6440803 is a prime.

It is a super-2 number, since 2×23218019² = 1078152812568722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23218049) 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, 55337 + ... + 55754.

It is an arithmetic number, because the mean of its divisors is an integer number (3332760).

Almost surely, 2^23218019 is an apocalyptic number.

23218019 is a deficient number, since it is larger than the sum of its proper divisors (3444061).

23218019 is a wasteful number, since it uses less digits than its factorization.

23218019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111121.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 23218019 is about 4818.5079640901. The cubic root of 23218019 is about 285.2824490315.

The spelling of 23218019 in words is "twenty-three million, two hundred eighteen thousand, nineteen".