12849440 has 24 divisors (see below), whose sum is σ = 30357180. Its totient is φ = 5139712.

The previous prime is 12849437. The next prime is 12849449. The reversal of 12849440 is 4494821.

It can be written as a sum of positive squares in 2 ways, for example, as 12645136 + 204304 = 3556^2 + 452^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 12849397 and 12849406.

It is not an unprimeable number, because it can be changed into a prime (12849449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39995 + ... + 40314.

Almost surely, 2^12849440 is an apocalyptic number.

12849440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12849440 is an abundant number, since it is smaller than the sum of its proper divisors (17507740).

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

12849440 is an equidigital number, since it uses as much as digits as its factorization.

12849440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80324 (or 80316 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 12849440 is about 3584.6115549666. The cubic root of 12849440 is about 234.2222059527. Note that the first 4 decimals are identical.

The spelling of 12849440 in words is "twelve million, eight hundred forty-nine thousand, four hundred forty".