6523440 has 160 divisors (see below), whose sum is σ = 25284096. Its totient is φ = 1351680.

The previous prime is 6523381. The next prime is 6523477. The reversal of 6523440 is 443256.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6523440.

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, 18304 + ... + 18656.

Almost surely, 2^6523440 is an apocalyptic number.

6523440 is a gapful number since it is divisible by the number (60) 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 6523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12642048).

6523440 is an abundant number, since it is smaller than the sum of its proper divisors (18760656).

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

6523440 is a wasteful number, since it uses less digits than its factorization.

6523440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 6523440 is about 2554.1025821216. The cubic root of 6523440 is about 186.8496222105.

Adding to 6523440 its reverse (443256), we get a palindrome (6966696).

The spelling of 6523440 in words is "six million, five hundred twenty-three thousand, four hundred forty".