420019999 has 4 divisors (see below), whose sum is σ = 480022864. Its totient is φ = 360017136.

The previous prime is 420019993. The next prime is 420020009. The reversal of 420019999 is 999910024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420019999 - 2¹⁷ = 419888927 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 (420019993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30001422 + ... + 30001435.

It is an arithmetic number, because the mean of its divisors is an integer number (120005716).

Almost surely, 2^420019999 is an apocalyptic number.

420019999 is a deficient number, since it is larger than the sum of its proper divisors (60002865).

420019999 is an equidigital number, since it uses as much as digits as its factorization.

420019999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60002864.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 420019999 is about 20494.3894517500. The cubic root of 420019999 is about 748.8991250379.

The spelling of 420019999 in words is "four hundred twenty million, nineteen thousand, nine hundred ninety-nine".