12261378 has 16 divisors (see below), whose sum is σ = 25121376. Its totient is φ = 3987360.

The previous prime is 12261373. The next prime is 12261383. The reversal of 12261378 is 87316221.

It is an interprime number because it is at equal distance from previous prime (12261373) and next prime (12261383).

It is not an unprimeable number, because it can be changed into a prime (12261371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24676 + ... + 25167.

It is an arithmetic number, because the mean of its divisors is an integer number (1570086).

Almost surely, 2^12261378 is an apocalyptic number.

12261378 is an abundant number, since it is smaller than the sum of its proper divisors (12859998).

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

12261378 is a wasteful number, since it uses less digits than its factorization.

12261378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49889.

The product of its digits is 4032, while the sum is 30.

The square root of 12261378 is about 3501.6250513155. The cubic root of 12261378 is about 230.5931633259.

Adding to 12261378 its reverse (87316221), we get a palindrome (99577599).

The spelling of 12261378 in words is "twelve million, two hundred sixty-one thousand, three hundred seventy-eight".