780408 has 32 divisors (see below), whose sum is σ = 2168400. Its totient is φ = 260064.

The previous prime is 780401. The next prime is 780421. The reversal of 780408 is 804087.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 780408.

It is not an unprimeable number, because it can be changed into a prime (780401) by changing a digit.

780408 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1591 + ... + 2022.

2⁷⁸⁰⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

780408 is an abundant number, since it is smaller than the sum of its proper divisors (1387992).

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

780408 is a wasteful number, since it uses less digits than its factorization.

780408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628 (or 3618 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 780408 is about 883.4070409500. The cubic root of 780408 is about 92.0676880572.

The spelling of 780408 in words is "seven hundred eighty thousand, four hundred eight".