780420 has 24 divisors (see below), whose sum is σ = 2185344. Its totient is φ = 208096.

The previous prime is 780401. The next prime is 780421. The reversal of 780420 is 24087.

It is a happy number.

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 780420.

It is not an unprimeable number, because it can be changed into a prime (780421) by changing a digit.

780420 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, 6444 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (91056).

2⁷⁸⁰⁴²⁰ is an apocalyptic number.

It is an amenable number.

780420 is an abundant number, since it is smaller than the sum of its proper divisors (1404924).

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

780420 is a wasteful number, since it uses less digits than its factorization.

780420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13019 (or 13017 counting only the distinct ones).

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

The square root of 780420 is about 883.4138328100. The cubic root of 780420 is about 92.0681599499.

The spelling of 780420 in words is "seven hundred eighty thousand, four hundred twenty".