12161378 has 4 divisors (see below), whose sum is σ = 18242070. Its totient is φ = 6080688.

The previous prime is 12161351. The next prime is 12161417. The reversal of 12161378 is 87316121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12159169 + 2209 = 3487^2 + 47^2 .

It is a super-2 number, since 2×12161378² = 295798229717768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12161378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3040343 + ... + 3040346.

Almost surely, 2^12161378 is an apocalyptic number.

12161378 is a deficient number, since it is larger than the sum of its proper divisors (6080692).

12161378 is an equidigital number, since it uses as much as digits as its factorization.

12161378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080691.

The product of its digits is 2016, while the sum is 29.

The square root of 12161378 is about 3487.3167335360. The cubic root of 12161378 is about 229.9645692115.

Adding to 12161378 its reverse (87316121), we get a palindrome (99477499).

The spelling of 12161378 in words is "twelve million, one hundred sixty-one thousand, three hundred seventy-eight".