12278738 has 4 divisors (see below), whose sum is σ = 18418110. Its totient is φ = 6139368.

The previous prime is 12278737. The next prime is 12278753. The reversal of 12278738 is 83787221.

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., 12229009 + 49729 = 3497^2 + 223^2 .

It is not an unprimeable number, because it can be changed into a prime (12278737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3069683 + ... + 3069686.

Almost surely, 2^12278738 is an apocalyptic number.

12278738 is a deficient number, since it is larger than the sum of its proper divisors (6139372).

12278738 is an equidigital number, since it uses as much as digits as its factorization.

12278738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6139371.

The product of its digits is 37632, while the sum is 38.

The square root of 12278738 is about 3504.1030235996. The cubic root of 12278738 is about 230.7019387443.

The spelling of 12278738 in words is "twelve million, two hundred seventy-eight thousand, seven hundred thirty-eight".