11523440 has 40 divisors (see below), whose sum is σ = 27721440. Its totient is φ = 4449536.

The previous prime is 11523439. The next prime is 11523461. The reversal of 11523440 is 4432511.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 164 + ... + 4803.

It is an arithmetic number, because the mean of its divisors is an integer number (693036).

Almost surely, 2^11523440 is an apocalyptic number.

11523440 is a gapful number since it is divisible by the number (10) 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 11523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13860720).

11523440 is an abundant number, since it is smaller than the sum of its proper divisors (16198000).

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

11523440 is a wasteful number, since it uses less digits than its factorization.

11523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 5003 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 11523440 is about 3394.6192717299. The cubic root of 11523440 is about 225.8711249993.

Adding to 11523440 its reverse (4432511), we get a palindrome (15955951).

The spelling of 11523440 in words is "eleven million, five hundred twenty-three thousand, four hundred forty".