12403640 has 16 divisors (see below), whose sum is σ = 27908280. Its totient is φ = 4961440.

The previous prime is 12403639. The next prime is 12403661. The reversal of 12403640 is 4630421.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 155006 + ... + 155085.

Almost surely, 2^12403640 is an apocalyptic number.

12403640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12403640 is an abundant number, since it is smaller than the sum of its proper divisors (15504640).

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

12403640 is a wasteful number, since it uses less digits than its factorization.

12403640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310102 (or 310098 counting only the distinct ones).

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

The square root of 12403640 is about 3521.8801796768. The cubic root of 12403640 is about 231.4815513663.

The spelling of 12403640 in words is "twelve million, four hundred three thousand, six hundred forty".