12905831 has 4 divisors (see below), whose sum is σ = 13117464. Its totient is φ = 12694200.

The previous prime is 12905803. The next prime is 12905861. The reversal of 12905831 is 13850921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12905831 - 2¹⁰ = 12904807 is a prime.

It is a super-2 number, since 2×12905831² = 333120947601122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12905794 and 12905803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12905861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105725 + ... + 105846.

It is an arithmetic number, because the mean of its divisors is an integer number (3279366).

Almost surely, 2^12905831 is an apocalyptic number.

12905831 is a deficient number, since it is larger than the sum of its proper divisors (211633).

12905831 is an equidigital number, since it uses as much as digits as its factorization.

12905831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211632.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12905831 is about 3592.4686498284. The cubic root of 12905831 is about 234.5643414809.

The spelling of 12905831 in words is "twelve million, nine hundred five thousand, eight hundred thirty-one".