420780 has 24 divisors (see below), whose sum is σ = 1178352. Its totient is φ = 112192.

The previous prime is 420779. The next prime is 420781. The reversal of 420780 is 87024.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (420779) and next prime (420781).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 420780.

It is not an unprimeable number, because it can be changed into a prime (420781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3447 + ... + 3566.

It is an arithmetic number, because the mean of its divisors is an integer number (49098).

2⁴²⁰⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

420780 is an abundant number, since it is smaller than the sum of its proper divisors (757572).

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

420780 is a wasteful number, since it uses less digits than its factorization.

420780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025 (or 7023 counting only the distinct ones).

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

The square root of 420780 is about 648.6755737655. The cubic root of 420780 is about 74.9350548891.

The spelling of 420780 in words is "four hundred twenty thousand, seven hundred eighty".