13870281 has 4 divisors (see below), whose sum is σ = 18493712. Its totient is φ = 9246852.

The previous prime is 13870277. The next prime is 13870309. The reversal of 13870281 is 18207831.

It is a happy number.

13870281 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13870281 - 2² = 13870277 is a prime.

It is a super-2 number, since 2×13870281² = 384769390037922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13870201) 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, 2311711 + ... + 2311716.

It is an arithmetic number, because the mean of its divisors is an integer number (4623428).

Almost surely, 2^13870281 is an apocalyptic number.

It is an amenable number.

13870281 is a deficient number, since it is larger than the sum of its proper divisors (4623431).

13870281 is an equidigital number, since it uses as much as digits as its factorization.

13870281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623430.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 13870281 is about 3724.2826154845. The cubic root of 13870281 is about 240.2675315290.

The spelling of 13870281 in words is "thirteen million, eight hundred seventy thousand, two hundred eighty-one".