780985 has 8 divisors (see below), whose sum is σ = 946440. Its totient is φ = 618624.

The previous prime is 780973. The next prime is 780991. The reversal of 780985 is 589087.

780985 = T₆₁ + T₆₂ + ... + T₁₆₉.

It can be written as a sum of positive squares in 4 ways, for example, as 251001 + 529984 = 501^2 + 728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 780985 - 2⁵ = 780953 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (118305).

2⁷⁸⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

780985 is a deficient number, since it is larger than the sum of its proper divisors (165455).

780985 is a wasteful number, since it uses less digits than its factorization.

780985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 780985 is about 883.7335571313. The cubic root of 780985 is about 92.0903727593.

The spelling of 780985 in words is "seven hundred eighty thousand, nine hundred eighty-five".