13920823 has 4 divisors (see below), whose sum is σ = 15909520. Its totient is φ = 11932128.

The previous prime is 13920811. The next prime is 13920833. The reversal of 13920823 is 32802931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32802931 = 7 ⋅4686133.

It is a cyclic number.

It is not a de Polignac number, because 13920823 - 2²¹ = 11823671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13920791 and 13920800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994338 + ... + 994351.

It is an arithmetic number, because the mean of its divisors is an integer number (3977380).

Almost surely, 2^13920823 is an apocalyptic number.

13920823 is a deficient number, since it is larger than the sum of its proper divisors (1988697).

13920823 is an equidigital number, since it uses as much as digits as its factorization.

13920823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988696.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 13920823 is about 3731.0619131824. The cubic root of 13920823 is about 240.5590152011.

The spelling of 13920823 in words is "thirteen million, nine hundred twenty thousand, eight hundred twenty-three".