780842 has 4 divisors (see below), whose sum is σ = 1171266. Its totient is φ = 390420.

The previous prime is 780841. The next prime is 780851. The reversal of 780842 is 248087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 758641 + 22201 = 871^2 + 149^2 .

It is not an unprimeable number, because it can be changed into a prime (780841) 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 as a sum of consecutive naturals, namely, 195209 + ... + 195212.

2⁷⁸⁰⁸⁴² is an apocalyptic number.

780842 is a deficient number, since it is larger than the sum of its proper divisors (390424).

780842 is a wasteful number, since it uses less digits than its factorization.

780842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390423.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 780842 is about 883.6526466887. The cubic root of 780842 is about 92.0847517691.

The spelling of 780842 in words is "seven hundred eighty thousand, eight hundred forty-two".