7878965 has 8 divisors (see below), whose sum is σ = 9710520. Its totient is φ = 6132672.

The previous prime is 7878961. The next prime is 7878967. The reversal of 7878965 is 5698787.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 872356 + 7006609 = 934^2 + 2647^2 .

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 7878965 - 2² = 7878961 is a prime.

It is a super-3 number, since 3×7878965³ (a number of 22 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878961) 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, 21110 + ... + 21479.

It is an arithmetic number, because the mean of its divisors is an integer number (1213815).

Almost surely, 2^7878965 is an apocalyptic number.

It is an amenable number.

7878965 is a deficient number, since it is larger than the sum of its proper divisors (1831555).

7878965 is a wasteful number, since it uses less digits than its factorization.

7878965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42631.

The product of its digits is 846720, while the sum is 50.

The square root of 7878965 is about 2806.9494117280. The cubic root of 7878965 is about 198.9862451879.

The spelling of 7878965 in words is "seven million, eight hundred seventy-eight thousand, nine hundred sixty-five".