12690506 has 4 divisors (see below), whose sum is σ = 19035762. Its totient is φ = 6345252.

The previous prime is 12690473. The next prime is 12690511. The reversal of 12690506 is 60509621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60509621 = 61 ⋅991961.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 24025 = 3559^2 + 155^2 .

It is a super-2 number, since 2×12690506² = 322097885072072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3172625 + ... + 3172628.

Almost surely, 2^12690506 is an apocalyptic number.

12690506 is a deficient number, since it is larger than the sum of its proper divisors (6345256).

12690506 is an equidigital number, since it uses as much as digits as its factorization.

12690506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345255.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 12690506 is about 3562.3736468821. The cubic root of 12690506 is about 233.2525030681.

The spelling of 12690506 in words is "twelve million, six hundred ninety thousand, five hundred six".