13782321 has 24 divisors (see below), whose sum is σ = 23489024. Its totient is φ = 7620480.

The previous prime is 13782319. The next prime is 13782331. The reversal of 13782321 is 12328731.

It is not a de Polignac number, because 13782321 - 2¹ = 13782319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13782331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1576 + ... + 5481.

Almost surely, 2^13782321 is an apocalyptic number.

It is an amenable number.

13782321 is a deficient number, since it is larger than the sum of its proper divisors (9706703).

13782321 is a wasteful number, since it uses less digits than its factorization.

13782321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7101 (or 7098 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 13782321 is about 3712.4548482103. The cubic root of 13782321 is about 239.7585592747.

The spelling of 13782321 in words is "thirteen million, seven hundred eighty-two thousand, three hundred twenty-one".