23909693 has 4 divisors (see below), whose sum is σ = 24031260. Its totient is φ = 23788128.

The previous prime is 23909689. The next prime is 23909707. The reversal of 23909693 is 39690932.

Added to its reverse (39690932) it gives a square (63600625 = 7975²).

It is a happy number.

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 17749369 + 6160324 = 4213^2 + 2482^2 .

It is a cyclic number.

It is not a de Polignac number, because 23909693 - 2² = 23909689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23909693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23909603) 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, 60488 + ... + 60881.

It is an arithmetic number, because the mean of its divisors is an integer number (6007815).

Almost surely, 2^23909693 is an apocalyptic number.

It is an amenable number.

23909693 is a deficient number, since it is larger than the sum of its proper divisors (121567).

23909693 is a wasteful number, since it uses less digits than its factorization.

23909693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121566.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 23909693 is about 4889.7538792868. The cubic root of 23909693 is about 288.0876670165.

Adding to 23909693 its reverse (39690932), we get a square (63600625 = 7975²).

The spelling of 23909693 in words is "twenty-three million, nine hundred nine thousand, six hundred ninety-three".