9967789 has 10 divisors (see below), whose sum is σ = 10829350.
Its totient is φ = 9174672.
The previous prime is 9967781. The next prime is 9967801. The reversal of 9967789 is 9877699.
It can be written as a sum of positive squares in 5 ways, for example, as 7518564 + 2449225 = 2742^2 + 1565^2
It is not a de Polignac number, because 9967789 - 23 = 9967781 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 (9967781) by changing a digit.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28387 + ... + 28735.
It is an arithmetic number, because the mean of its divisors is an integer number (1082935).
Almost surely, 29967789 is an apocalyptic number.
It is an amenable number.
9967789 is a deficient number, since it is larger than the sum of its proper divisors (861561).
9967789 is an frugal number, since it uses more digits than its factorization.
9967789 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 401 (or 362 counting only the distinct ones).
The product of its digits is 1714608, while the sum is 55.
The square root of 9967789 is about 3157.1805459935.
The cubic root of 9967789 is about 215.2118985350.
The spelling of 9967789 in words is "nine million, nine hundred sixty-seven thousand, seven hundred eighty-nine".