7990945 has 8 divisors (see below), whose sum is σ = 9720936. Its totient is φ = 6304896.

The previous prime is 7990937. The next prime is 7990951. The reversal of 7990945 is 5490997.

It can be written as a sum of positive squares in 4 ways, for example, as 1760929 + 6230016 = 1327^2 + 2496^2 .

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 7990945 - 2³ = 7990937 is a prime.

It is a Duffinian number.

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, 10582 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (1215117).

Almost surely, 2^7990945 is an apocalyptic number.

It is an amenable number.

7990945 is a deficient number, since it is larger than the sum of its proper divisors (1729991).

7990945 is a wasteful number, since it uses less digits than its factorization.

7990945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21971.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 7990945 is about 2826.8259585620. The cubic root of 7990945 is about 199.9245131790.

The spelling of 7990945 in words is "seven million, nine hundred ninety thousand, nine hundred forty-five".