12091378 has 16 divisors (see below), whose sum is σ = 20061720. Its totient is φ = 5429376.

The previous prime is 12091363. The next prime is 12091379. The reversal of 12091378 is 87319021.

It can be written as a sum of positive squares in 4 ways, for example, as 12089529 + 1849 = 3477^2 + 43^2 .

It is not an unprimeable number, because it can be changed into a prime (12091379) 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, 5323 + ... + 7246.

Almost surely, 2^12091378 is an apocalyptic number.

12091378 is a deficient number, since it is larger than the sum of its proper divisors (7970342).

12091378 is a wasteful number, since it uses less digits than its factorization.

12091378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12621.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12091378 is about 3477.2658799695. The cubic root of 12091378 is about 229.5225002187.

The spelling of 12091378 in words is "twelve million, ninety-one thousand, three hundred seventy-eight".