420878 has 8 divisors (see below), whose sum is σ = 636672. Its totient is φ = 208656.

The previous prime is 420859. The next prime is 420899. The reversal of 420878 is 878024.

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

It is a self number, because there is not a number n which added to its sum of digits gives 420878.

It is a congruent number.

It is an unprimeable number.

420878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575 + ... + 1082.

It is an arithmetic number, because the mean of its divisors is an integer number (79584).

2⁴²⁰⁸⁷⁸ is an apocalyptic number.

420878 is a deficient number, since it is larger than the sum of its proper divisors (215794).

420878 is a wasteful number, since it uses less digits than its factorization.

420878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 420878 is about 648.7511078989. The cubic root of 420878 is about 74.9408719157.

The spelling of 420878 in words is "four hundred twenty thousand, eight hundred seventy-eight".