12787906 has 4 divisors (see below), whose sum is σ = 19181862. Its totient is φ = 6393952.

The previous prime is 12787897. The next prime is 12787919. The reversal of 12787906 is 60978721.

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., 11162281 + 1625625 = 3341^2 + 1275^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196975 + ... + 3196978.

Almost surely, 2^12787906 is an apocalyptic number.

12787906 is a deficient number, since it is larger than the sum of its proper divisors (6393956).

12787906 is an equidigital number, since it uses as much as digits as its factorization.

12787906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393955.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 12787906 is about 3576.0181766876. The cubic root of 12787906 is about 233.8477227781.

The spelling of 12787906 in words is "twelve million, seven hundred eighty-seven thousand, nine hundred six".