23409540 has 192 divisors, whose sum is σ = 90961920. Its totient is φ = 4855680.

The previous prime is 23409523. The next prime is 23409541. The reversal of 23409540 is 4590432.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23409541) 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 63 ways as a sum of consecutive naturals, for example, 41299 + ... + 41861.

It is an arithmetic number, because the mean of its divisors is an integer number (473760).

Almost surely, 2^23409540 is an apocalyptic number.

23409540 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 23409540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45480960).

23409540 is an abundant number, since it is smaller than the sum of its proper divisors (67552380).

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

23409540 is a wasteful number, since it uses less digits than its factorization.

23409540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 23409540 is about 4838.3406246357. The cubic root of 23409540 is about 286.0647154969.

Adding to 23409540 its reverse (4590432), we get a palindrome (27999972).

The spelling of 23409540 in words is "twenty-three million, four hundred nine thousand, five hundred forty".