16420399 has 2 divisors, whose sum is σ = 16420400. Its totient is φ = 16420398.

The previous prime is 16420373. The next prime is 16420403. The reversal of 16420399 is 99302461.

It is a strong prime.

It is an emirp because it is prime and its reverse (99302461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16420399 - 2¹¹ = 16418351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16420319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210199 + 8210200.

It is an arithmetic number, because the mean of its divisors is an integer number (8210200).

Almost surely, 2^16420399 is an apocalyptic number.

16420399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16420399 is an equidigital number, since it uses as much as digits as its factorization.

16420399 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 34.

The square root of 16420399 is about 4052.2091505745. The cubic root of 16420399 is about 254.1721145239.

The spelling of 16420399 in words is "sixteen million, four hundred twenty thousand, three hundred ninety-nine".