23187840 has 128 divisors (see below), whose sum is σ = 79682400. Its totient is φ = 5701632.

The previous prime is 23187817. The next prime is 23187851. The reversal of 23187840 is 4878132.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24496 + ... + 25424.

Almost surely, 2^23187840 is an apocalyptic number.

23187840 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 23187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39841200).

23187840 is an abundant number, since it is smaller than the sum of its proper divisors (56494560).

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

23187840 is a wasteful number, since it uses less digits than its factorization.

23187840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 23187840 is about 4815.3753747761. The cubic root of 23187840 is about 285.1587911664.

The spelling of 23187840 in words is "twenty-three million, one hundred eighty-seven thousand, eight hundred forty".