23130440 has 32 divisors (see below), whose sum is σ = 52678080. Its totient is φ = 9139392.

The previous prime is 23130409. The next prime is 23130449. The reversal of 23130440 is 4403132.

It is not an unprimeable number, because it can be changed into a prime (23130449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (1646190).

Almost surely, 2^23130440 is an apocalyptic number.

23130440 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 23130440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26339040).

23130440 is an abundant number, since it is smaller than the sum of its proper divisors (29547640).

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

23130440 is a wasteful number, since it uses less digits than its factorization.

23130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061 (or 7057 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23130440 is about 4809.4116064234. The cubic root of 23130440 is about 284.9232993557.

Adding to 23130440 its reverse (4403132), we get a palindrome (27533572).

The spelling of 23130440 in words is "twenty-three million, one hundred thirty thousand, four hundred forty".