12889905 has 16 divisors (see below), whose sum is σ = 23570304. Its totient is φ = 5892480.

The previous prime is 12889897. The next prime is 12889909. The reversal of 12889905 is 50998821.

It is a happy number.

12889905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12889905 - 2³ = 12889897 is a prime.

It is a super-2 number, since 2×12889905² = 332299301818050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12889909) 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, 61276 + ... + 61485.

It is an arithmetic number, because the mean of its divisors is an integer number (1473144).

Almost surely, 2^12889905 is an apocalyptic number.

12889905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12889905 is a deficient number, since it is larger than the sum of its proper divisors (10680399).

12889905 is a wasteful number, since it uses less digits than its factorization.

12889905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122776.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 12889905 is about 3590.2513839563. The cubic root of 12889905 is about 234.4678163939.

The spelling of 12889905 in words is "twelve million, eight hundred eighty-nine thousand, nine hundred five".