780989 has 4 divisors (see below), whose sum is σ = 852000. Its totient is φ = 709980.

The previous prime is 780973. The next prime is 780991. The reversal of 780989 is 989087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989087 = 11 ⋅89917.

It is a cyclic number.

It is not a de Polignac number, because 780989 - 2⁴ = 780973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780389) 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, 35489 + ... + 35510.

It is an arithmetic number, because the mean of its divisors is an integer number (213000).

2⁷⁸⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

780989 is a deficient number, since it is larger than the sum of its proper divisors (71011).

780989 is a wasteful number, since it uses less digits than its factorization.

780989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71010.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 780989 is about 883.7358202540. The cubic root of 780989 is about 92.0905299800.

The spelling of 780989 in words is "seven hundred eighty thousand, nine hundred eighty-nine".