420578 has 16 divisors (see below), whose sum is σ = 677376. Its totient is φ = 195360.

The previous prime is 420571. The next prime is 420593. The reversal of 420578 is 875024.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2⁴²⁰⁵⁷⁸ is an apocalyptic number.

420578 is a deficient number, since it is larger than the sum of its proper divisors (256798).

420578 is a wasteful number, since it uses less digits than its factorization.

420578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 420578 is about 648.5198532042. The cubic root of 420578 is about 74.9230618413.

The spelling of 420578 in words is "four hundred twenty thousand, five hundred seventy-eight".