12306440 has 48 divisors (see below), whose sum is σ = 28925100. Its totient is φ = 4706688.

The previous prime is 12306439. The next prime is 12306443. The reversal of 12306440 is 4460321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12264004 + 42436 = 3502^2 + 206^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12306443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119429 + ... + 119531.

Almost surely, 2^12306440 is an apocalyptic number.

12306440 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 12306440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14462550).

12306440 is an abundant number, since it is smaller than the sum of its proper divisors (16618660).

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

12306440 is a wasteful number, since it uses less digits than its factorization.

12306440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 12306440 is about 3508.0535913808. The cubic root of 12306440 is about 230.8753036009.

Adding to 12306440 its reverse (4460321), we get a palindrome (16766761).

The spelling of 12306440 in words is "twelve million, three hundred six thousand, four hundred forty".