13897813 has 8 divisors (see below), whose sum is σ = 14323736. Its totient is φ = 13478400.

The previous prime is 13897787. The next prime is 13897831. The reversal of 13897813 is 31879831.

It can be written as a sum of positive squares in 4 ways, for example, as 887364 + 13010449 = 942^2 + 3607^2 .

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 13897813 - 2¹⁷ = 13766741 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 (13897843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2893 + ... + 6013.

It is an arithmetic number, because the mean of its divisors is an integer number (1790467).

Almost surely, 2^13897813 is an apocalyptic number.

It is an amenable number.

13897813 is a deficient number, since it is larger than the sum of its proper divisors (425923).

13897813 is an equidigital number, since it uses as much as digits as its factorization.

13897813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255.

The product of its digits is 36288, while the sum is 40.

The square root of 13897813 is about 3727.9770653801. The cubic root of 13897813 is about 240.4264005436.

The spelling of 13897813 in words is "thirteen million, eight hundred ninety-seven thousand, eight hundred thirteen".