23643140 has 12 divisors (see below), whose sum is σ = 49650636. Its totient is φ = 9457248.

The previous prime is 23643133. The next prime is 23643143. The reversal of 23643140 is 4134632.

23643140 = T₁₇₆₈ + T₁₇₆₉ + ... + T₁₇₈₂.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8213956 + 15429184 = 2866^2 + 3928^2 .

It is not an unprimeable number, because it can be changed into a prime (23643143) 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, 591059 + ... + 591098.

It is an arithmetic number, because the mean of its divisors is an integer number (4137553).

Almost surely, 2^23643140 is an apocalyptic number.

23643140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23643140 is an abundant number, since it is smaller than the sum of its proper divisors (26007496).

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

23643140 is a wasteful number, since it uses less digits than its factorization.

23643140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182166 (or 1182164 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 23643140 is about 4862.4212075878. The cubic root of 23643140 is about 287.0130989906.

Adding to 23643140 its reverse (4134632), we get a palindrome (27777772).

The spelling of 23643140 in words is "twenty-three million, six hundred forty-three thousand, one hundred forty".