9779989 has 8 divisors (see below), whose sum is σ = 10154520. Its totient is φ = 9419200.

The previous prime is 9779983. The next prime is 9779993. The reversal of 9779989 is 9899779.

9779989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 8439025 = 1158^2 + 2905^2 .

It is not a de Polignac number, because 9779989 - 2²¹ = 7682837 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9779983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24189 + ... + 24589.

It is an arithmetic number, because the mean of its divisors is an integer number (1269315).

Almost surely, 2^9779989 is an apocalyptic number.

It is an amenable number.

9779989 is a deficient number, since it is larger than the sum of its proper divisors (374531).

9779989 is an frugal number, since it uses more digits than its factorization.

9779989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 430 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 58.

The square root of 9779989 is about 3127.2973955158. The cubic root of 9779989 is about 213.8517402647.

The spelling of 9779989 in words is "nine million, seven hundred seventy-nine thousand, nine hundred eighty-nine".