23402240 has 72 divisors (see below), whose sum is σ = 57395520. Its totient is φ = 9138176.

The previous prime is 23402231. The next prime is 23402257. The reversal of 23402240 is 4220432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59966 + ... + 60354.

It is an arithmetic number, because the mean of its divisors is an integer number (797160).

Almost surely, 2^23402240 is an apocalyptic number.

23402240 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 23402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28697760).

23402240 is an abundant number, since it is smaller than the sum of its proper divisors (33993280).

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

23402240 is an equidigital number, since it uses as much as digits as its factorization.

23402240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 23402240 is about 4837.5861749430. The cubic root of 23402240 is about 286.0349770579.

Adding to 23402240 its reverse (4220432), we get a palindrome (27622672).

The spelling of 23402240 in words is "twenty-three million, four hundred two thousand, two hundred forty".