420399 has 12 divisors (see below), whose sum is σ = 694096. Its totient is φ = 240192.

The previous prime is 420397. The next prime is 420419. The reversal of 420399 is 993024.

It is not a de Polignac number, because 420399 - 2¹ = 420397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420397) 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 11 ways as a sum of consecutive naturals, for example, 3274 + ... + 3399.

2⁴²⁰³⁹⁹ is an apocalyptic number.

420399 is a deficient number, since it is larger than the sum of its proper divisors (273697).

420399 is a wasteful number, since it uses less digits than its factorization.

420399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6686 (or 6683 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 420399 is about 648.3818319478. The cubic root of 420399 is about 74.9124311290.

The spelling of 420399 in words is "four hundred twenty thousand, three hundred ninety-nine".