4389491785 has 24 divisors (see below), whose sum is σ = 6134166720. Its totient is φ = 3006599904.

The previous prime is 4389491731. The next prime is 4389491789. The reversal of 4389491785 is 5871949834.

It is not a de Polignac number, because 4389491785 - 2²⁹ = 3852620873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4389491789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222556 + ... + 241474.

It is an arithmetic number, because the mean of its divisors is an integer number (255590280).

Almost surely, 2^4389491785 is an apocalyptic number.

It is an amenable number.

4389491785 is a deficient number, since it is larger than the sum of its proper divisors (1744674935).

4389491785 is a wasteful number, since it uses less digits than its factorization.

4389491785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19885 (or 19878 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The square root of 4389491785 is about 66253.2398075747. The cubic root of 4389491785 is about 1637.3370158860.

The spelling of 4389491785 in words is "four billion, three hundred eighty-nine million, four hundred ninety-one thousand, seven hundred eighty-five".