12889239 has 32 divisors (see below), whose sum is σ = 20117760. Its totient is φ = 7257600.

The previous prime is 12889237. The next prime is 12889243. The reversal of 12889239 is 93298821.

12889239 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 is not a de Polignac number, because 12889239 - 2¹ = 12889237 is a prime.

It is a super-2 number, since 2×12889239² = 332264963998242, 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 12889239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12889231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38079 + ... + 38415.

It is an arithmetic number, because the mean of its divisors is an integer number (628680).

Almost surely, 2^12889239 is an apocalyptic number.

12889239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12889239 is a deficient number, since it is larger than the sum of its proper divisors (7228521).

12889239 is a wasteful number, since it uses less digits than its factorization.

12889239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 62208, while the sum is 42.

The square root of 12889239 is about 3590.1586315928. The cubic root of 12889239 is about 234.4637781367.

The spelling of 12889239 in words is "twelve million, eight hundred eighty-nine thousand, two hundred thirty-nine".