13871993 has 4 divisors (see below), whose sum is σ = 13994868. Its totient is φ = 13749120.

The previous prime is 13871989. The next prime is 13871999. The reversal of 13871993 is 39917831.

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 1283689 + 12588304 = 1133^2 + 3548^2 .

It is a cyclic number.

It is not a de Polignac number, because 13871993 - 2² = 13871989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13871993.

It is not an unprimeable number, because it can be changed into a prime (13871999) 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, 61268 + ... + 61493.

It is an arithmetic number, because the mean of its divisors is an integer number (3498717).

Almost surely, 2^13871993 is an apocalyptic number.

It is an amenable number.

13871993 is a deficient number, since it is larger than the sum of its proper divisors (122875).

13871993 is a wasteful number, since it uses less digits than its factorization.

13871993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122874.

The product of its digits is 40824, while the sum is 41.

The square root of 13871993 is about 3724.5124513149. The cubic root of 13871993 is about 240.2774164787.

The spelling of 13871993 in words is "thirteen million, eight hundred seventy-one thousand, nine hundred ninety-three".