12887818 has 4 divisors (see below), whose sum is σ = 19331730. Its totient is φ = 6443908.

The previous prime is 12887813. The next prime is 12887827. The reversal of 12887818 is 81878821.

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., 11881809 + 1006009 = 3447^2 + 1003^2 .

It is a super-2 number, since 2×12887818² = 332191705602248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12887813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221953 + ... + 3221956.

Almost surely, 2^12887818 is an apocalyptic number.

12887818 is a deficient number, since it is larger than the sum of its proper divisors (6443912).

12887818 is an equidigital number, since it uses as much as digits as its factorization.

12887818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443911.

The product of its digits is 57344, while the sum is 43.

The square root of 12887818 is about 3589.9607240191. The cubic root of 12887818 is about 234.4551615102.

The spelling of 12887818 in words is "twelve million, eight hundred eighty-seven thousand, eight hundred eighteen".