23821140 has 96 divisors (see below), whose sum is σ = 78059520. Its totient is φ = 5314176.

The previous prime is 23821129. The next prime is 23821157. The reversal of 23821140 is 4112832.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17401 + ... + 18719.

It is an arithmetic number, because the mean of its divisors is an integer number (813120).

Almost surely, 2^23821140 is an apocalyptic number.

23821140 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 23821140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39029760).

23821140 is an abundant number, since it is smaller than the sum of its proper divisors (54238380).

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

23821140 is a wasteful number, since it uses less digits than its factorization.

23821140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 23821140 is about 4880.6905249155. The cubic root of 23821140 is about 287.7315689446.

Adding to 23821140 its reverse (4112832), we get a palindrome (27933972).

The spelling of 23821140 in words is "twenty-three million, eight hundred twenty-one thousand, one hundred forty".