23401440 has 96 divisors (see below), whose sum is σ = 81920160. Its totient is φ = 6239232.

The previous prime is 23401379. The next prime is 23401451. The reversal of 23401440 is 4410432.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1612 + ... + 7028.

It is an arithmetic number, because the mean of its divisors is an integer number (853335).

Almost surely, 2^23401440 is an apocalyptic number.

23401440 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 23401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40960080).

23401440 is an abundant number, since it is smaller than the sum of its proper divisors (58518720).

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

23401440 is a wasteful number, since it uses less digits than its factorization.

23401440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441 (or 5427 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 23401440 is about 4837.5034883708. The cubic root of 23401440 is about 286.0317176749.

Adding to 23401440 its reverse (4410432), we get a palindrome (27811872).

The spelling of 23401440 in words is "twenty-three million, four hundred one thousand, four hundred forty".