780442 has 12 divisors (see below), whose sum is σ = 1268190. Its totient is φ = 360048.

The previous prime is 780433. The next prime is 780457. The reversal of 780442 is 244087.

It can be written as a sum of positive squares in 3 ways, for example, as 531441 + 249001 = 729^2 + 499^2 .

It is an Ulam number.

It is an unprimeable 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 5 ways as a sum of consecutive naturals, for example, 817 + ... + 1492.

2⁷⁸⁰⁴⁴² is an apocalyptic number.

780442 is a deficient number, since it is larger than the sum of its proper divisors (487748).

780442 is a wasteful number, since it uses less digits than its factorization.

780442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 780442 is about 883.4262844177. The cubic root of 780442 is about 92.0690250740.

The spelling of 780442 in words is "seven hundred eighty thousand, four hundred forty-two".