23905140 has 144 divisors (see below), whose sum is σ = 79978752. Its totient is φ = 5316864.

The previous prime is 23905139. The next prime is 23905157. The reversal of 23905140 is 4150932.

It is a self number, because there is not a number n which added to its sum of digits gives 23905140.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 138094 + ... + 138266.

It is an arithmetic number, because the mean of its divisors is an integer number (555408).

Almost surely, 2^23905140 is an apocalyptic number.

23905140 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 23905140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39989376).

23905140 is an abundant number, since it is smaller than the sum of its proper divisors (56073612).

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

23905140 is a wasteful number, since it uses less digits than its factorization.

23905140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 23905140 is about 4889.2882917660. The cubic root of 23905140 is about 288.0693795042.

The spelling of 23905140 in words is "twenty-three million, nine hundred five thousand, one hundred forty".