23101440 has 128 divisors (see below), whose sum is σ = 75496320. Its totient is φ = 6029312.

The previous prime is 23101439. The next prime is 23101447. The reversal of 23101440 is 4410132.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (23101447) 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, 491497 + ... + 491543.

It is an arithmetic number, because the mean of its divisors is an integer number (589815).

Almost surely, 2^23101440 is an apocalyptic number.

23101440 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 23101440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37748160).

23101440 is an abundant number, since it is smaller than the sum of its proper divisors (52394880).

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

23101440 is an frugal number, since it uses more digits than its factorization.

23101440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 23101440 is about 4806.3957390128. The cubic root of 23101440 is about 284.8041744959.

Adding to 23101440 its reverse (4410132), we get a palindrome (27511572).

The spelling of 23101440 in words is "twenty-three million, one hundred one thousand, four hundred forty".