12861953 has 4 divisors (see below), whose sum is σ = 13851348. Its totient is φ = 11872560.

The previous prime is 12861949. The next prime is 12861983. The reversal of 12861953 is 35916821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3301489 + 9560464 = 1817^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 12861953 - 2² = 12861949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861983) 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, 494678 + ... + 494703.

It is an arithmetic number, because the mean of its divisors is an integer number (3462837).

Almost surely, 2^12861953 is an apocalyptic number.

12861953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12861953 is a deficient number, since it is larger than the sum of its proper divisors (989395).

12861953 is an equidigital number, since it uses as much as digits as its factorization.

12861953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989394.

The product of its digits is 12960, while the sum is 35.

The square root of 12861953 is about 3586.3565076551. The cubic root of 12861953 is about 234.2982111227.

The spelling of 12861953 in words is "twelve million, eight hundred sixty-one thousand, nine hundred fifty-three".