780981 has 8 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 518592.

The previous prime is 780973. The next prime is 780991. The reversal of 780981 is 189087.

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

It is not a de Polignac number, because 780981 - 2³ = 780973 is a prime.

It is a super-2 number, since 2×780981² = 1219862644722, which contains 22 as substring.

780981 is a lucky number.

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 780981.

It is not an unprimeable number, because it can be changed into a prime (780931) by changing a digit.

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, 1021 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (130680).

2⁷⁸⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

780981 is a deficient number, since it is larger than the sum of its proper divisors (264459).

780981 is a wasteful number, since it uses less digits than its factorization.

780981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 780981 is about 883.7312940029. The cubic root of 780981 is about 92.0902155382.

The spelling of 780981 in words is "seven hundred eighty thousand, nine hundred eighty-one".