13820399 has 2 divisors, whose sum is σ = 13820400. Its totient is φ = 13820398.

The previous prime is 13820393. The next prime is 13820407. The reversal of 13820399 is 99302831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13820399 - 2⁴ = 13820383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13820393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6910199 + 6910200.

It is an arithmetic number, because the mean of its divisors is an integer number (6910200).

Almost surely, 2^13820399 is an apocalyptic number.

13820399 is a deficient number, since it is larger than the sum of its proper divisors (1).

13820399 is an equidigital number, since it uses as much as digits as its factorization.

13820399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 13820399 is about 3717.5797234222. The cubic root of 13820399 is about 239.9791590699.

The spelling of 13820399 in words is "thirteen million, eight hundred twenty thousand, three hundred ninety-nine".