23009819 has 16 divisors (see below), whose sum is σ = 27400128. Its totient is φ = 18911232.

The previous prime is 23009807. The next prime is 23009839. The reversal of 23009819 is 91890032.

It is a cyclic number.

It is not a de Polignac number, because 23009819 - 2⁴ = 23009803 is a prime.

It is a super-2 number, since 2×23009819² = 1058903540825522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23009839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18299 + ... + 19515.

It is an arithmetic number, because the mean of its divisors is an integer number (1712508).

Almost surely, 2^23009819 is an apocalyptic number.

23009819 is a deficient number, since it is larger than the sum of its proper divisors (4390309).

23009819 is a wasteful number, since it uses less digits than its factorization.

23009819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 23009819 is about 4796.8551155940. The cubic root of 23009819 is about 284.4271616911.

The spelling of 23009819 in words is "twenty-three million, nine thousand, eight hundred nineteen".