23043640 has 32 divisors (see below), whose sum is σ = 53116560. Its totient is φ = 8992000.

The previous prime is 23043623. The next prime is 23043659. The reversal of 23043640 is 4634032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5386 + ... + 8665.

Almost surely, 2^23043640 is an apocalyptic number.

23043640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23043640 is an abundant number, since it is smaller than the sum of its proper divisors (30072920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23043640 is a wasteful number, since it uses less digits than its factorization.

23043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14103 (or 14099 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 23043640 is about 4800.3791516921. The cubic root of 23043640 is about 284.5664486299.

Adding to 23043640 its reverse (4634032), we get a palindrome (27677672).

It can be divided in two parts, 2304 and 3640, that multiplied together give a triangular number (8386560 = T₄₀₉₅).

The spelling of 23043640 in words is "twenty-three million, forty-three thousand, six hundred forty".