13121893 has 8 divisors (see below), whose sum is σ = 13492440. Its totient is φ = 12756480.

The previous prime is 13121887. The next prime is 13121921. The reversal of 13121893 is 39812131.

It can be written as a sum of positive squares in 4 ways, for example, as 717409 + 12404484 = 847^2 + 3522^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13121893 - 2¹³ = 13113701 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 (13121803) 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 7 ways as a sum of consecutive naturals, for example, 4221 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (1686555).

Almost surely, 2^13121893 is an apocalyptic number.

It is an amenable number.

13121893 is a deficient number, since it is larger than the sum of its proper divisors (370547).

13121893 is an equidigital number, since it uses as much as digits as its factorization.

13121893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567.

The product of its digits is 1296, while the sum is 28.

The square root of 13121893 is about 3622.4153544286. The cubic root of 13121893 is about 235.8660843721.

The spelling of 13121893 in words is "thirteen million, one hundred twenty-one thousand, eight hundred ninety-three".