12900391 has 4 divisors (see below), whose sum is σ = 14743312. Its totient is φ = 11057472.

The previous prime is 12900367. The next prime is 12900397. The reversal of 12900391 is 19300921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19300921 = 29 ⋅665549.

It is a cyclic number.

It is not a de Polignac number, because 12900391 - 2¹³ = 12892199 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 (12900397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921450 + ... + 921463.

It is an arithmetic number, because the mean of its divisors is an integer number (3685828).

Almost surely, 2^12900391 is an apocalyptic number.

12900391 is a deficient number, since it is larger than the sum of its proper divisors (1842921).

12900391 is an equidigital number, since it uses as much as digits as its factorization.

12900391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842920.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 12900391 is about 3591.7114305022. The cubic root of 12900391 is about 234.5313793946.

The spelling of 12900391 in words is "twelve million, nine hundred thousand, three hundred ninety-one".