23840213 has 4 divisors (see below), whose sum is σ = 24876768. Its totient is φ = 22803660.

The previous prime is 23840207. The next prime is 23840227. The reversal of 23840213 is 31204832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23840213 - 2⁴ = 23840197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1036531 = 23840213 / (2 + 3 + 8 + 4 + 0 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23842213) 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, 518243 + ... + 518288.

It is an arithmetic number, because the mean of its divisors is an integer number (6219192).

Almost surely, 2^23840213 is an apocalyptic number.

23840213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

23840213 is a deficient number, since it is larger than the sum of its proper divisors (1036555).

23840213 is a wasteful number, since it uses less digits than its factorization.

23840213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036554.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 23840213 is about 4882.6440582946. The cubic root of 23840213 is about 287.8083416514.

The spelling of 23840213 in words is "twenty-three million, eight hundred forty thousand, two hundred thirteen".