420239 has 8 divisors (see below), whose sum is σ = 446160. Its totient is φ = 395136.

The previous prime is 420221. The next prime is 420241. The reversal of 420239 is 932024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420239 - 2¹⁶ = 354703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420269) 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 7 ways as a sum of consecutive naturals, for example, 1079 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (55770).

2⁴²⁰²³⁹ is an apocalyptic number.

420239 is a deficient number, since it is larger than the sum of its proper divisors (25921).

420239 is a wasteful number, since it uses less digits than its factorization.

420239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 420239 is about 648.2584361194. The cubic root of 420239 is about 74.9029262619.

It can be divided in two parts, 4202 and 39, that multiplied together give a triangular number (163878 = T₅₇₂).

The spelling of 420239 in words is "four hundred twenty thousand, two hundred thirty-nine".