23109240 has 256 divisors, whose sum is σ = 89994240. Its totient is φ = 4608000.

The previous prime is 23109223. The next prime is 23109253. The reversal of 23109240 is 4290132.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 378810 + ... + 378870.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

Almost surely, 2^23109240 is an apocalyptic number.

23109240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23109240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44997120).

23109240 is an abundant number, since it is smaller than the sum of its proper divisors (66885000).

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

23109240 is a wasteful number, since it uses less digits than its factorization.

23109240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23109240 is about 4807.2070893607. The cubic root of 23109240 is about 284.8362247719.

Adding to 23109240 its reverse (4290132), we get a palindrome (27399372).

It can be divided in two parts, 231092 and 40, that added together give a palindrome (231132).

The spelling of 23109240 in words is "twenty-three million, one hundred nine thousand, two hundred forty".