780040 has 16 divisors (see below), whose sum is σ = 1755180. Its totient is φ = 312000.

The previous prime is 780037. The next prime is 780041. The reversal of 780040 is 40087.

780040 = 221² + 222² + ... + 235².

It is a happy number.

780040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 2116 = 882^2 + 46^2 .

It is not an unprimeable number, because it can be changed into a prime (780041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9711 + ... + 9790.

2⁷⁸⁰⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

780040 is an abundant number, since it is smaller than the sum of its proper divisors (975140).

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

780040 is a wasteful number, since it uses less digits than its factorization.

780040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19512 (or 19508 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 780040 is about 883.1987318831. The cubic root of 780040 is about 92.0532143306.

The spelling of 780040 in words is "seven hundred eighty thousand, forty".