23678909 has 4 divisors (see below), whose sum is σ = 25071804. Its totient is φ = 22286016.

The previous prime is 23678899. The next prime is 23678911. The reversal of 23678909 is 90987632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13579225 + 10099684 = 3685^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 23678909 - 2⁸ = 23678653 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 23678909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23678989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696422 + ... + 696455.

It is an arithmetic number, because the mean of its divisors is an integer number (6267951).

Almost surely, 2^23678909 is an apocalyptic number.

It is an amenable number.

23678909 is a deficient number, since it is larger than the sum of its proper divisors (1392895).

23678909 is a wasteful number, since it uses less digits than its factorization.

23678909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392894.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 23678909 is about 4866.0979233879. The cubic root of 23678909 is about 287.1577639090.

The spelling of 23678909 in words is "twenty-three million, six hundred seventy-eight thousand, nine hundred nine".