12378154 has 4 divisors (see below), whose sum is σ = 18567234. Its totient is φ = 6189076.

The previous prime is 12378151. The next prime is 12378161. The reversal of 12378154 is 45187321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45187321 = 233 ⋅193937.

It can be written as a sum of positive squares in only one way, i.e., 8862529 + 3515625 = 2977^2 + 1875^2 .

It is not an unprimeable number, because it can be changed into a prime (12378151) by changing a digit.

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, 3094537 + ... + 3094540.

Almost surely, 2^12378154 is an apocalyptic number.

12378154 is a deficient number, since it is larger than the sum of its proper divisors (6189080).

12378154 is an equidigital number, since it uses as much as digits as its factorization.

12378154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6189079.

The product of its digits is 6720, while the sum is 31.

The square root of 12378154 is about 3518.2600813470. The cubic root of 12378154 is about 231.3228994418.

The spelling of 12378154 in words is "twelve million, three hundred seventy-eight thousand, one hundred fifty-four".