4205985457 has 4 divisors (see below), whose sum is σ = 4210894116. Its totient is φ = 4201076800.

The previous prime is 4205985439. The next prime is 4205985479. The reversal of 4205985457 is 7545895024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3257099041 + 948886416 = 57071^2 + 30804^2 .

It is a cyclic number.

It is not a de Polignac number, because 4205985457 - 2²⁷ = 4071767729 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4205985457.

It is not an unprimeable number, because it can be changed into a prime (4205985437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2453044 + ... + 2454757.

It is an arithmetic number, because the mean of its divisors is an integer number (1052723529).

Almost surely, 2^4205985457 is an apocalyptic number.

It is an amenable number.

4205985457 is a deficient number, since it is larger than the sum of its proper divisors (4908659).

4205985457 is an equidigital number, since it uses as much as digits as its factorization.

4205985457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4908658.

The product of its (nonzero) digits is 2016000, while the sum is 49.

The square root of 4205985457 is about 64853.5693466443. The cubic root of 4205985457 is about 1614.1947193528.

The spelling of 4205985457 in words is "four billion, two hundred five million, nine hundred eighty-five thousand, four hundred fifty-seven".