13782881 has 4 divisors (see below), whose sum is σ = 15751872. Its totient is φ = 11813892.

The previous prime is 13782877. The next prime is 13782883. The reversal of 13782881 is 18828731.

13782881 is digitally balanced in base 2, because in such base 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, and also an emirpimes, since its reverse is a distinct semiprime: 18828731 = 3623 ⋅5197.

It is a cyclic number.

It is not a de Polignac number, because 13782881 - 2² = 13782877 is a prime.

It is a super-2 number, since 2×13782881² = 379935617320322, 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 (13782883) 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, 984485 + ... + 984498.

It is an arithmetic number, because the mean of its divisors is an integer number (3937968).

Almost surely, 2^13782881 is an apocalyptic number.

It is an amenable number.

13782881 is a deficient number, since it is larger than the sum of its proper divisors (1968991).

13782881 is an equidigital number, since it uses as much as digits as its factorization.

13782881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968990.

The product of its digits is 21504, while the sum is 38.

The square root of 13782881 is about 3712.5302692369. The cubic root of 13782881 is about 239.7618065017.

The spelling of 13782881 in words is "thirteen million, seven hundred eighty-two thousand, eight hundred eighty-one".