23857440 has 96 divisors (see below), whose sum is σ = 78454656. Its totient is φ = 6082560.

The previous prime is 23857423. The next prime is 23857451. The reversal of 23857440 is 4475832.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

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, 9960 + ... + 12120.

It is an arithmetic number, because the mean of its divisors is an integer number (817236).

Almost surely, 2^23857440 is an apocalyptic number.

23857440 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 23857440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39227328).

23857440 is an abundant number, since it is smaller than the sum of its proper divisors (54597216).

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

23857440 is a wasteful number, since it uses less digits than its factorization.

23857440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 2194 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 23857440 is about 4884.4078453790. The cubic root of 23857440 is about 287.8776486460.

The spelling of 23857440 in words is "twenty-three million, eight hundred fifty-seven thousand, four hundred forty".