7945649 has 4 divisors (see below), whose sum is σ = 8291136. Its totient is φ = 7600164.

The previous prime is 7945633. The next prime is 7945661. The reversal of 7945649 is 9465497.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7945649 - 2⁴ = 7945633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7945699) 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, 172709 + ... + 172754.

It is an arithmetic number, because the mean of its divisors is an integer number (2072784).

Almost surely, 2^7945649 is an apocalyptic number.

It is an amenable number.

7945649 is a deficient number, since it is larger than the sum of its proper divisors (345487).

7945649 is a wasteful number, since it uses less digits than its factorization.

7945649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345486.

The product of its digits is 272160, while the sum is 44.

The square root of 7945649 is about 2818.8027600384. The cubic root of 7945649 is about 199.5460454057.

The spelling of 7945649 in words is "seven million, nine hundred forty-five thousand, six hundred forty-nine".