420904 has 16 divisors (see below), whose sum is σ = 861120. Its totient is φ = 191280.

The previous prime is 420899. The next prime is 420919. The reversal of 420904 is 409024.

It is a pancake number, because a pancake can be divided into 420904 parts by 917 straight cuts.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2304 + ... + 2479.

It is an arithmetic number, because the mean of its divisors is an integer number (53820).

2⁴²⁰⁹⁰⁴ is an apocalyptic number.

420904 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

420904 is an abundant number, since it is smaller than the sum of its proper divisors (440216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420904 is a wasteful number, since it uses less digits than its factorization.

420904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 420904 is about 648.7711460908. The cubic root of 420904 is about 74.9424150569.

Adding to 420904 its reverse (409024), we get a palindrome (829928).

The spelling of 420904 in words is "four hundred twenty thousand, nine hundred four".