12342440 has 32 divisors (see below), whose sum is σ = 30296160. Its totient is φ = 4488000.

The previous prime is 12342437. The next prime is 12342461. The reversal of 12342440 is 4424321.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13586 + ... + 14465.

It is an arithmetic number, because the mean of its divisors is an integer number (946755).

Almost surely, 2^12342440 is an apocalyptic number.

12342440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12342440 is an abundant number, since it is smaller than the sum of its proper divisors (17953720).

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

12342440 is a wasteful number, since it uses less digits than its factorization.

12342440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28073 (or 28069 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 12342440 is about 3513.1808948587. The cubic root of 12342440 is about 231.1002107641.

Adding to 12342440 its reverse (4424321), we get a palindrome (16766761).

The spelling of 12342440 in words is "twelve million, three hundred forty-two thousand, four hundred forty".