12402378 has 12 divisors (see below), whose sum is σ = 26871858. Its totient is φ = 4134120.

The previous prime is 12402353. The next prime is 12402389. The reversal of 12402378 is 87320421.

It can be written as a sum of positive squares in only one way, i.e., 6365529 + 6036849 = 2523^2 + 2457^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 344493 + ... + 344528.

Almost surely, 2^12402378 is an apocalyptic number.

12402378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12402378 is an abundant number, since it is smaller than the sum of its proper divisors (14469480).

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

12402378 is a wasteful number, since it uses less digits than its factorization.

12402378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689029 (or 689026 counting only the distinct ones).

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

The square root of 12402378 is about 3521.7010094555. The cubic root of 12402378 is about 231.4737004552.

Adding to 12402378 its reverse (87320421), we get a palindrome (99722799).

The spelling of 12402378 in words is "twelve million, four hundred two thousand, three hundred seventy-eight".