12351816 has 24 divisors (see below), whose sum is σ = 33453030. Its totient is φ = 4117248.

The previous prime is 12351803. The next prime is 12351817. The reversal of 12351816 is 61815321.

12351816 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11249316 + 1102500 = 3354^2 + 1050^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 12351816.

It is not an unprimeable number, because it can be changed into a prime (12351817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85705 + ... + 85848.

Almost surely, 2^12351816 is an apocalyptic number.

It is an amenable number.

12351816 is an abundant number, since it is smaller than the sum of its proper divisors (21101214).

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

12351816 is a wasteful number, since it uses less digits than its factorization.

12351816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171565 (or 171558 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 12351816 is about 3514.5150447821. The cubic root of 12351816 is about 231.1587147859.

The spelling of 12351816 in words is "twelve million, three hundred fifty-one thousand, eight hundred sixteen".