12902391 has 12 divisors (see below), whose sum is σ = 18915832. Its totient is φ = 8472816.

The previous prime is 12902369. The next prime is 12902399. The reversal of 12902391 is 19320921.

12902391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12902391 - 2⁶ = 12902327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12902399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10096 + ... + 11301.

Almost surely, 2^12902391 is an apocalyptic number.

12902391 is a deficient number, since it is larger than the sum of its proper divisors (6013441).

12902391 is a wasteful number, since it uses less digits than its factorization.

12902391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21470 (or 21467 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 12902391 is about 3591.9898385157. The cubic root of 12902391 is about 234.5434988856.

The spelling of 12902391 in words is "twelve million, nine hundred two thousand, three hundred ninety-one".