12323440 has 20 divisors (see below), whose sum is σ = 28652184. Its totient is φ = 4929344.

The previous prime is 12323429. The next prime is 12323459. The reversal of 12323440 is 4432321.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76942 + ... + 77101.

Almost surely, 2^12323440 is an apocalyptic number.

12323440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12323440 is an abundant number, since it is smaller than the sum of its proper divisors (16328744).

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

12323440 is a wasteful number, since it uses less digits than its factorization.

12323440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154056 (or 154050 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 12323440 is about 3510.4757512337. The cubic root of 12323440 is about 230.9815643415.

Adding to 12323440 its reverse (4432321), we get a palindrome (16755761).

The spelling of 12323440 in words is "twelve million, three hundred twenty-three thousand, four hundred forty".