23440213 has 4 divisors (see below), whose sum is σ = 23463328. Its totient is φ = 23417100.

The previous prime is 23440171. The next prime is 23440217. The reversal of 23440213 is 31204432.

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 23440213 - 2¹⁷ = 23309141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440217) 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, 9963 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (5865832).

Almost surely, 2^23440213 is an apocalyptic number.

It is an amenable number.

23440213 is a deficient number, since it is larger than the sum of its proper divisors (23115).

23440213 is a wasteful number, since it uses less digits than its factorization.

23440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23114.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 23440213 is about 4841.5093720864. The cubic root of 23440213 is about 286.1896023803.

Adding to 23440213 its reverse (31204432), we get a palindrome (54644645).

It can be divided in two parts, 23440 and 213, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 23440213 in words is "twenty-three million, four hundred forty thousand, two hundred thirteen".