13897973 has 4 divisors (see below), whose sum is σ = 14054220. Its totient is φ = 13741728.

The previous prime is 13897943. The next prime is 13897997. The reversal of 13897973 is 37979831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37979831 = 23 ⋅1651297.

It can be written as a sum of positive squares in 2 ways, for example, as 4765489 + 9132484 = 2183^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 13897973 - 2⁸ = 13897717 is a prime.

It is a super-3 number, since 3×13897973³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13897913) 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, 77990 + ... + 78167.

It is an arithmetic number, because the mean of its divisors is an integer number (3513555).

Almost surely, 2^13897973 is an apocalyptic number.

It is an amenable number.

13897973 is a deficient number, since it is larger than the sum of its proper divisors (156247).

13897973 is an equidigital number, since it uses as much as digits as its factorization.

13897973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156246.

The product of its digits is 285768, while the sum is 47.

The square root of 13897973 is about 3727.9985246778. The cubic root of 13897973 is about 240.4273231846.

The spelling of 13897973 in words is "thirteen million, eight hundred ninety-seven thousand, nine hundred seventy-three".