12403278 has 12 divisors (see below), whose sum is σ = 26873808. Its totient is φ = 4134420.

The previous prime is 12403273. The next prime is 12403283. The reversal of 12403278 is 87230421.

12403278 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12403273) and next prime (12403283).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 344518 + ... + 344553.

It is an arithmetic number, because the mean of its divisors is an integer number (2239484).

Almost surely, 2^12403278 is an apocalyptic number.

12403278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12403278 is an abundant number, since it is smaller than the sum of its proper divisors (14470530).

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

12403278 is a wasteful number, since it uses less digits than its factorization.

12403278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689079 (or 689076 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12403278 is about 3521.8287862984. The cubic root of 12403278 is about 231.4792994162.

Adding to 12403278 its reverse (87230421), we get a palindrome (99633699).

The spelling of 12403278 in words is "twelve million, four hundred three thousand, two hundred seventy-eight".