23142540 has 24 divisors (see below), whose sum is σ = 64799280. Its totient is φ = 6171328.

The previous prime is 23142529. The next prime is 23142541. The reversal of 23142540 is 4524132.

It is not an unprimeable number, because it can be changed into a prime (23142541) 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, 192795 + ... + 192914.

It is an arithmetic number, because the mean of its divisors is an integer number (2699970).

Almost surely, 2^23142540 is an apocalyptic number.

23142540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23142540 is an abundant number, since it is smaller than the sum of its proper divisors (41656740).

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

23142540 is a wasteful number, since it uses less digits than its factorization.

23142540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385721 (or 385719 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 23142540 is about 4810.6693920909. The cubic root of 23142540 is about 284.9729737376.

Adding to 23142540 its reverse (4524132), we get a palindrome (27666672).

The spelling of 23142540 in words is "twenty-three million, one hundred forty-two thousand, five hundred forty".