12281919 has 16 divisors (see below), whose sum is σ = 18068064. Its totient is φ = 7372800.

The previous prime is 12281909. The next prime is 12281947. The reversal of 12281919 is 91918221.

It is not a de Polignac number, because 12281919 - 2⁹ = 12281407 is a prime.

It is a super-2 number, since 2×12281919² = 301691068645122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12281919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12281909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2242 + ... + 5439.

It is an arithmetic number, because the mean of its divisors is an integer number (1129254).

Almost surely, 2^12281919 is an apocalyptic number.

12281919 is a deficient number, since it is larger than the sum of its proper divisors (5786145).

12281919 is a wasteful number, since it uses less digits than its factorization.

12281919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7738.

The product of its digits is 2592, while the sum is 33.

The square root of 12281919 is about 3504.5568906782. The cubic root of 12281919 is about 230.7218593448.

It can be divided in two parts, 1228 and 1919, that multiplied together give a palindrome (2356532).

The spelling of 12281919 in words is "twelve million, two hundred eighty-one thousand, nine hundred nineteen".