4238921785 has 16 divisors (see below), whose sum is σ = 5818749696. Its totient is φ = 2904003648.

The previous prime is 4238921783. The next prime is 4238921789. The reversal of 4238921785 is 5871298324.

4238921785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4238921785 - 2¹ = 4238921783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4238921783) 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, 17149 + ... + 93658.

It is an arithmetic number, because the mean of its divisors is an integer number (363671856).

Almost surely, 2^4238921785 is an apocalyptic number.

It is an amenable number.

4238921785 is a deficient number, since it is larger than the sum of its proper divisors (1579827911).

4238921785 is a wasteful number, since it uses less digits than its factorization.

4238921785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111912.

The product of its digits is 967680, while the sum is 49.

The square root of 4238921785 is about 65107.0025803677. The cubic root of 4238921785 is about 1618.3972596737.

The spelling of 4238921785 in words is "four billion, two hundred thirty-eight million, nine hundred twenty-one thousand, seven hundred eighty-five".