7975845 has 18 divisors (see below), whose sum is σ = 13857714. Its totient is φ = 4243680.

The previous prime is 7975843. The next prime is 7975861. The reversal of 7975845 is 5485797.

It can be written as a sum of positive squares in 3 ways, for example, as 1179396 + 6796449 = 1086^2 + 2607^2 .

It is not a de Polignac number, because 7975845 - 2¹ = 7975843 is a prime.

It is a super-2 number, since 2×7975845² = 127228206928050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7975845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7975843) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18735 + ... + 19155.

It is an arithmetic number, because the mean of its divisors is an integer number (769873).

Almost surely, 2^7975845 is an apocalyptic number.

It is an amenable number.

7975845 is a deficient number, since it is larger than the sum of its proper divisors (5881869).

7975845 is an equidigital number, since it uses as much as digits as its factorization.

7975845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 429 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 7975845 is about 2824.1538555822. The cubic root of 7975845 is about 199.7985054011.

Multiplying 7975845 by its sum of digits (45), we get a square (358913025 = 18945²).

7975845 divided by its sum of digits (45) gives a square (177241 = 421²).

The spelling of 7975845 in words is "seven million, nine hundred seventy-five thousand, eight hundred forty-five".