4389945 has 16 divisors (see below), whose sum is σ = 8027520. Its totient is φ = 2006784.

The previous prime is 4389919. The next prime is 4389947. The reversal of 4389945 is 5499834.

It is not a de Polignac number, because 4389945 - 2⁶ = 4389881 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4389897 and 4389906.

It is not an unprimeable number, because it can be changed into a prime (4389947) 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, 20800 + ... + 21009.

It is an arithmetic number, because the mean of its divisors is an integer number (501720).

Almost surely, 2^4389945 is an apocalyptic number.

It is an amenable number.

4389945 is a deficient number, since it is larger than the sum of its proper divisors (3637575).

4389945 is a wasteful number, since it uses less digits than its factorization.

4389945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41824.

The product of its digits is 155520, while the sum is 42.

The square root of 4389945 is about 2095.2195589007. The cubic root of 4389945 is about 163.7393365626.

The spelling of 4389945 in words is "four million, three hundred eighty-nine thousand, nine hundred forty-five".