23409999 has 8 divisors (see below), whose sum is σ = 34681520. Its totient is φ = 15606648.

The previous prime is 23409977. The next prime is 23410019. The reversal of 23409999 is 99990432.

It is not a de Polignac number, because 23409999 - 2¹⁶ = 23344463 is a prime.

It is a Duffinian number.

23409999 is a modest number, since divided by 9999 gives 2340 as remainder.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23407999) 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, 433492 + ... + 433545.

It is an arithmetic number, because the mean of its divisors is an integer number (4335190).

Almost surely, 2^23409999 is an apocalyptic number.

23409999 is a deficient number, since it is larger than the sum of its proper divisors (11271521).

23409999 is an equidigital number, since it uses as much as digits as its factorization.

23409999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867046 (or 867040 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 23409999 is about 4838.3880580210. The cubic root of 23409999 is about 286.0665851455.

The spelling of 23409999 in words is "twenty-three million, four hundred nine thousand, nine hundred ninety-nine".