12651816 has 16 divisors (see below), whose sum is σ = 31629600. Its totient is φ = 4217264.

The previous prime is 12651809. The next prime is 12651833. The reversal of 12651816 is 61815621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263556 + ... + 263603.

It is an arithmetic number, because the mean of its divisors is an integer number (1976850).

Almost surely, 2^12651816 is an apocalyptic number.

It is an amenable number.

12651816 is an abundant number, since it is smaller than the sum of its proper divisors (18977784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12651816 is a wasteful number, since it uses less digits than its factorization.

12651816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527168 (or 527164 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 12651816 is about 3556.9391335810. The cubic root of 12651816 is about 233.0152200143.

It can be divided in two parts, 1265 and 1816, that added together give a triangular number (3081 = T₇₈).

The spelling of 12651816 in words is "twelve million, six hundred fifty-one thousand, eight hundred sixteen".