23540140 has 48 divisors (see below), whose sum is σ = 54698112. Its totient is φ = 8453376.

The previous prime is 23540137. The next prime is 23540147. The reversal of 23540140 is 4104532.

It is not an unprimeable number, because it can be changed into a prime (23540147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8397 + ... + 10843.

It is an arithmetic number, because the mean of its divisors is an integer number (1139544).

Almost surely, 2^23540140 is an apocalyptic number.

23540140 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 23540140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27349056).

23540140 is an abundant number, since it is smaller than the sum of its proper divisors (31157972).

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

23540140 is a wasteful number, since it uses less digits than its factorization.

23540140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2504 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23540140 is about 4851.8182158857. The cubic root of 23540140 is about 286.5957068521.

Adding to 23540140 its reverse (4104532), we get a palindrome (27644672).

The spelling of 23540140 in words is "twenty-three million, five hundred forty thousand, one hundred forty".