12515806 has 4 divisors (see below), whose sum is σ = 18773712. Its totient is φ = 6257902.

The previous prime is 12515779. The next prime is 12515807. The reversal of 12515806 is 60851521.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12515807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3128950 + ... + 3128953.

It is an arithmetic number, because the mean of its divisors is an integer number (4693428).

Almost surely, 2^12515806 is an apocalyptic number.

12515806 is a deficient number, since it is larger than the sum of its proper divisors (6257906).

12515806 is an equidigital number, since it uses as much as digits as its factorization.

12515806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6257905.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 12515806 is about 3537.7685057109. The cubic root of 12515806 is about 232.1772204166.

It can be divided in two parts, 125 and 15806, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 12515806 in words is "twelve million, five hundred fifteen thousand, eight hundred six".