13872081 has 4 divisors (see below), whose sum is σ = 18496112. Its totient is φ = 9248052.

The previous prime is 13872073. The next prime is 13872107. The reversal of 13872081 is 18027831.

It is a happy number.

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 13872081 - 2³ = 13872073 is a prime.

It is a super-2 number, since 2×13872081² = 384869262541122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13872031) 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, 2312011 + ... + 2312016.

It is an arithmetic number, because the mean of its divisors is an integer number (4624028).

Almost surely, 2^13872081 is an apocalyptic number.

It is an amenable number.

13872081 is a deficient number, since it is larger than the sum of its proper divisors (4624031).

13872081 is an equidigital number, since it uses as much as digits as its factorization.

13872081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624030.

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

The square root of 13872081 is about 3724.5242649230. The cubic root of 13872081 is about 240.2779245616.

The spelling of 13872081 in words is "thirteen million, eight hundred seventy-two thousand, eighty-one".