23018919 has 24 divisors (see below), whose sum is σ = 38559360. Its totient is φ = 11956560.

The previous prime is 23018887. The next prime is 23018923. The reversal of 23018919 is 91981032.

It is not a de Polignac number, because 23018919 - 2⁵ = 23018887 is a prime.

It is a super-2 number, since 2×23018919² = 1059741263857122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 23018919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23018819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1989 + ... + 7070.

It is an arithmetic number, because the mean of its divisors is an integer number (1606640).

Almost surely, 2^23018919 is an apocalyptic number.

23018919 is a deficient number, since it is larger than the sum of its proper divisors (15540441).

23018919 is a wasteful number, since it uses less digits than its factorization.

23018919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091 (or 9080 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 23018919 is about 4797.8035599637. The cubic root of 23018919 is about 284.4646521503.

The spelling of 23018919 in words is "twenty-three million, eighteen thousand, nine hundred nineteen".