7865945 has 8 divisors (see below), whose sum is σ = 9454536. Its totient is φ = 6282496.

The previous prime is 7865933. The next prime is 7865959. The reversal of 7865945 is 5495687.

It can be written as a sum of positive squares in 4 ways, for example, as 597529 + 7268416 = 773^2 + 2696^2 .

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 7865945 - 2⁴ = 7865929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7865896 and 7865905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4289 + ... + 5841.

It is an arithmetic number, because the mean of its divisors is an integer number (1181817).

Almost surely, 2^7865945 is an apocalyptic number.

It is an amenable number.

7865945 is a deficient number, since it is larger than the sum of its proper divisors (1588591).

7865945 is a wasteful number, since it uses less digits than its factorization.

7865945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its digits is 302400, while the sum is 44.

The square root of 7865945 is about 2804.6292090043. The cubic root of 7865945 is about 198.8765764126.

The spelling of 7865945 in words is "seven million, eight hundred sixty-five thousand, nine hundred forty-five".