4391945 has 16 divisors (see below), whose sum is σ = 5624640. Its totient is φ = 3282624.

The previous prime is 4391941. The next prime is 4391953. The reversal of 4391945 is 5491934.

It is a cyclic number.

It is not a de Polignac number, because 4391945 - 2² = 4391941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4391941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7607 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

Almost surely, 2^4391945 is an apocalyptic number.

It is an amenable number.

4391945 is a deficient number, since it is larger than the sum of its proper divisors (1232695).

4391945 is a wasteful number, since it uses less digits than its factorization.

4391945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its digits is 19440, while the sum is 35.

The square root of 4391945 is about 2095.6967815025. The cubic root of 4391945 is about 163.7641986018.

The spelling of 4391945 in words is "four million, three hundred ninety-one thousand, nine hundred forty-five".