13870891 has 2 divisors, whose sum is σ = 13870892. Its totient is φ = 13870890.

The previous prime is 13870867. The next prime is 13870921. The reversal of 13870891 is 19807831.

It is a weak prime.

It is an emirp because it is prime and its reverse (19807831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13870891 - 2⁵ = 13870859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13870891.

It is not a weakly prime, because it can be changed into another prime (13870391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6935445 + 6935446.

It is an arithmetic number, because the mean of its divisors is an integer number (6935446).

Almost surely, 2^13870891 is an apocalyptic number.

13870891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13870891 is an equidigital number, since it uses as much as digits as its factorization.

13870891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 13870891 is about 3724.3645095506. The cubic root of 13870891 is about 240.2710537130.

The spelling of 13870891 in words is "thirteen million, eight hundred seventy thousand, eight hundred ninety-one".