12291856 has 10 divisors (see below), whose sum is σ = 23815502. Its totient is φ = 6145920.

The previous prime is 12291827. The next prime is 12291857. The reversal of 12291856 is 65819221.

12291856 is nontrivially palindromic in base 12.

12291856 is digitally balanced in base 2, because in such base 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., 10890000 + 1401856 = 3300^2 + 1184^2 .

It is not an unprimeable number, because it can be changed into a prime (12291857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384105 + ... + 384136.

Almost surely, 2^12291856 is an apocalyptic number.

12291856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12291856 is a deficient number, since it is larger than the sum of its proper divisors (11523646).

12291856 is an equidigital number, since it uses as much as digits as its factorization.

12291856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768249 (or 768243 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 12291856 is about 3505.9743296265. The cubic root of 12291856 is about 230.7840663739.

The spelling of 12291856 in words is "twelve million, two hundred ninety-one thousand, eight hundred fifty-six".