420842 has 4 divisors (see below), whose sum is σ = 631266. Its totient is φ = 210420.

The previous prime is 420811. The next prime is 420851. The reversal of 420842 is 248024.

420842 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 290521 + 130321 = 539^2 + 361^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105209 + ... + 105212.

2⁴²⁰⁸⁴² is an apocalyptic number.

420842 is a deficient number, since it is larger than the sum of its proper divisors (210424).

420842 is a wasteful number, since it uses less digits than its factorization.

420842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210423.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 420842 is about 648.7233616882. The cubic root of 420842 is about 74.9387351537.

Adding to 420842 its reverse (248024), we get a palindrome (668866).

The spelling of 420842 in words is "four hundred twenty thousand, eight hundred forty-two".