23380440 has 128 divisors (see below), whose sum is σ = 75764160. Its totient is φ = 5750784.

The previous prime is 23380429. The next prime is 23380447. The reversal of 23380440 is 4408332.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23380440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23380447) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 148842 + ... + 148998.

Almost surely, 2^23380440 is an apocalyptic number.

23380440 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 23380440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37882080).

23380440 is an abundant number, since it is smaller than the sum of its proper divisors (52383720).

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

23380440 is a wasteful number, since it uses less digits than its factorization.

23380440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 23380440 is about 4835.3324601314. The cubic root of 23380440 is about 285.9461322904.

Adding to 23380440 its reverse (4408332), we get a palindrome (27788772).

The spelling of 23380440 in words is "twenty-three million, three hundred eighty thousand, four hundred forty".