23345440 has 48 divisors (see below), whose sum is σ = 56214648. Its totient is φ = 9158656.

The previous prime is 23345407. The next prime is 23345447. The reversal of 23345440 is 4454332.

It can be written as a sum of positive squares in 4 ways, for example, as 23155344 + 190096 = 4812^2 + 436^2 .

It is not an unprimeable number, because it can be changed into a prime (23345447) 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, 7104 + ... + 9856.

Almost surely, 2^23345440 is an apocalyptic number.

23345440 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 23345440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28107324).

23345440 is an abundant number, since it is smaller than the sum of its proper divisors (32869208).

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

23345440 is a wasteful number, since it uses less digits than its factorization.

23345440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821 (or 2813 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 23345440 is about 4831.7119119418. The cubic root of 23345440 is about 285.8033760268.

Adding to 23345440 its reverse (4454332), we get a palindrome (27799772).

The spelling of 23345440 in words is "twenty-three million, three hundred forty-five thousand, four hundred forty".