23928809 has 16 divisors (see below), whose sum is σ = 27838080. Its totient is φ = 20401920.

The previous prime is 23928803. The next prime is 23928823. The reversal of 23928809 is 90882932.

23928809 = 346² + 347² + ... + 483².

It is a de Polignac number, because none of the positive numbers 2^k-23928809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23928803) 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, 5819 + ... + 9039.

It is an arithmetic number, because the mean of its divisors is an integer number (1739880).

Almost surely, 2^23928809 is an apocalyptic number.

It is an amenable number.

23928809 is a deficient number, since it is larger than the sum of its proper divisors (3909271).

23928809 is a wasteful number, since it uses less digits than its factorization.

23928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 23928809 is about 4891.7081883530. The cubic root of 23928809 is about 288.1644227328.

The spelling of 23928809 in words is "twenty-three million, nine hundred twenty-eight thousand, eight hundred nine".