7789985 has 16 divisors (see below), whose sum is σ = 11149056. Its totient is φ = 5108928.

The previous prime is 7789979. The next prime is 7789987. The reversal of 7789985 is 5899877.

7789985 = 135² + 136² + ... + 295².

It is a cyclic number.

It is not a de Polignac number, because 7789985 - 2⁸ = 7789729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7789987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4034 + ... + 5643.

It is an arithmetic number, because the mean of its divisors is an integer number (696816).

Almost surely, 2^7789985 is an apocalyptic number.

It is an amenable number.

7789985 is a deficient number, since it is larger than the sum of its proper divisors (3359071).

7789985 is a wasteful number, since it uses less digits than its factorization.

7789985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9712.

The product of its digits is 1270080, while the sum is 53.

The square root of 7789985 is about 2791.0544602354. The cubic root of 7789985 is about 198.2343329715.

The spelling of 7789985 in words is "seven million, seven hundred eighty-nine thousand, nine hundred eighty-five".