420999 has 4 divisors (see below), whose sum is σ = 561336. Its totient is φ = 280664.

The previous prime is 420997. The next prime is 421009. The reversal of 420999 is 999024.

It is a happy number.

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 420999 - 2¹ = 420997 is a prime.

It is a D-number.

420999 is a modest number, since divided by 999 gives 420 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70164 + ... + 70169.

It is an arithmetic number, because the mean of its divisors is an integer number (140334).

2⁴²⁰⁹⁹⁹ is an apocalyptic number.

420999 is a deficient number, since it is larger than the sum of its proper divisors (140337).

420999 is a wasteful number, since it uses less digits than its factorization.

420999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140336.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 420999 is about 648.8443573000. The cubic root of 420999 is about 74.9480529172.

The spelling of 420999 in words is "four hundred twenty thousand, nine hundred ninety-nine".