7993945 has 4 divisors (see below), whose sum is σ = 9592740. Its totient is φ = 6395152.

The previous prime is 7993913. The next prime is 7993957. The reversal of 7993945 is 5493997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4214809 + 3779136 = 2053^2 + 1944^2 .

It is a cyclic number.

It is not a de Polignac number, because 7993945 - 2⁵ = 7993913 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7993895 and 7993904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799390 + ... + 799399.

It is an arithmetic number, because the mean of its divisors is an integer number (2398185).

Almost surely, 2^7993945 is an apocalyptic number.

It is an amenable number.

7993945 is a deficient number, since it is larger than the sum of its proper divisors (1598795).

7993945 is a wasteful number, since it uses less digits than its factorization.

7993945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598794.

The product of its digits is 306180, while the sum is 46.

The square root of 7993945 is about 2827.3565392430. The cubic root of 7993945 is about 199.9495289311.

The spelling of 7993945 in words is "seven million, nine hundred ninety-three thousand, nine hundred forty-five".