7978789 has 8 divisors (see below), whose sum is σ = 9820160. Its totient is φ = 6312816.

The previous prime is 7978783. The next prime is 7978793. The reversal of 7978789 is 9878797.

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

It is a cyclic number.

It is not a de Polignac number, because 7978789 - 2³ = 7978781 is a prime.

It is a super-2 number, since 2×7978789² = 127322147813042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978781) 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, 43749 + ... + 43930.

It is an arithmetic number, because the mean of its divisors is an integer number (1227520).

Almost surely, 2^7978789 is an apocalyptic number.

It is an amenable number.

7978789 is a deficient number, since it is larger than the sum of its proper divisors (1841371).

7978789 is a wasteful number, since it uses less digits than its factorization.

7978789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87699.

The product of its digits is 1778112, while the sum is 55.

The square root of 7978789 is about 2824.6750255560. The cubic root of 7978789 is about 199.8230852186.

The spelling of 7978789 in words is "seven million, nine hundred seventy-eight thousand, seven hundred eighty-nine".