23113440 has 144 divisors (see below), whose sum is σ = 90181728. Its totient is φ = 5280768.

The previous prime is 23113417. The next prime is 23113471. The reversal of 23113440 is 4431132.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×23113440² = 1068462217267200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8934 + ... + 11226.

It is an arithmetic number, because the mean of its divisors is an integer number (626262).

Almost surely, 2^23113440 is an apocalyptic number.

23113440 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 23113440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45090864).

23113440 is an abundant number, since it is smaller than the sum of its proper divisors (67068288).

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

23113440 is a wasteful number, since it uses less digits than its factorization.

23113440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 23113440 is about 4807.6439136026. The cubic root of 23113440 is about 284.8534796258.

Adding to 23113440 its reverse (4431132), we get a palindrome (27544572).

The spelling of 23113440 in words is "twenty-three million, one hundred thirteen thousand, four hundred forty".