7927945 has 4 divisors (see below), whose sum is σ = 9513540. Its totient is φ = 6342352.

The previous prime is 7927943. The next prime is 7927979. The reversal of 7927945 is 5497297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5497297 = 13 ⋅422869.

It can be written as a sum of positive squares in 2 ways, for example, as 6056521 + 1871424 = 2461^2 + 1368^2 .

It is a cyclic number.

It is not a de Polignac number, because 7927945 - 2¹ = 7927943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7927943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792790 + ... + 792799.

It is an arithmetic number, because the mean of its divisors is an integer number (2378385).

Almost surely, 2^7927945 is an apocalyptic number.

It is an amenable number.

7927945 is a deficient number, since it is larger than the sum of its proper divisors (1585595).

7927945 is a wasteful number, since it uses less digits than its factorization.

7927945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585594.

The product of its digits is 158760, while the sum is 43.

The square root of 7927945 is about 2815.6606684755. The cubic root of 7927945 is about 199.3977298405.

The spelling of 7927945 in words is "seven million, nine hundred twenty-seven thousand, nine hundred forty-five".