12733440 has 88 divisors (see below), whose sum is σ = 40776240. Its totient is φ = 3391488.

The previous prime is 12733433. The next prime is 12733447. The reversal of 12733440 is 4433721.

It is an interprime number because it is at equal distance from previous prime (12733433) and next prime (12733447).

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 12733440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12733447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14946 + ... + 15774.

Almost surely, 2^12733440 is an apocalyptic number.

12733440 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 12733440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20388120).

12733440 is an abundant number, since it is smaller than the sum of its proper divisors (28042800).

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

12733440 is an equidigital number, since it uses as much as digits as its factorization.

12733440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 12733440 is about 3568.3945970142. The cubic root of 12733440 is about 233.5152504227.

The spelling of 12733440 in words is "twelve million, seven hundred thirty-three thousand, four hundred forty".