12440385 has 28 divisors (see below), whose sum is σ = 22389012. Its totient is φ = 6632928.

The previous prime is 12440381. The next prime is 12440411. The reversal of 12440385 is 58304421.

It can be written as a sum of positive squares in 2 ways, for example, as 8661249 + 3779136 = 2943^2 + 1944^2 .

It is not a de Polignac number, because 12440385 - 2² = 12440381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12440381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1939 + ... + 5351.

Almost surely, 2^12440385 is an apocalyptic number.

12440385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12440385 is a deficient number, since it is larger than the sum of its proper divisors (9948627).

12440385 is an frugal number, since it uses more digits than its factorization.

12440385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436 (or 3421 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 12440385 is about 3527.0929956552. The cubic root of 12440385 is about 231.7099091740.

The spelling of 12440385 in words is "twelve million, four hundred forty thousand, three hundred eighty-five".