420870 has 16 divisors (see below), whose sum is σ = 1010160. Its totient is φ = 112224.

The previous prime is 420859. The next prime is 420899. The reversal of 420870 is 78024.

It is a happy number.

420870 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

420870 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 7 ways as a sum of consecutive naturals, for example, 6985 + ... + 7044.

It is an arithmetic number, because the mean of its divisors is an integer number (63135).

2⁴²⁰⁸⁷⁰ is an apocalyptic number.

420870 is an abundant number, since it is smaller than the sum of its proper divisors (589290).

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

420870 is a wasteful number, since it uses less digits than its factorization.

420870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14039.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 420870 is about 648.7449421768. The cubic root of 420870 is about 74.9403970902.

Adding to 420870 its reverse (78024), we get a palindrome (498894).

It can be divided in two parts, 4208 and 70, that added together give a triangular number (4278 = T₉₂).

The spelling of 420870 in words is "four hundred twenty thousand, eight hundred seventy".