4238399665 has 8 divisors (see below), whose sum is σ = 5182043688. Its totient is φ = 3326743680.

The previous prime is 4238399629. The next prime is 4238399687. The reversal of 4238399665 is 5669938324.

4238399665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 837060624 + 3401339041 = 28932^2 + 58321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4238399665 - 2⁹ = 4238399153 is a prime.

It is a super-2 number, since 2×4238399665² = 35928063440544224450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7996716 + ... + 7997245.

It is an arithmetic number, because the mean of its divisors is an integer number (647755461).

Almost surely, 2^4238399665 is an apocalyptic number.

It is an amenable number.

4238399665 is a deficient number, since it is larger than the sum of its proper divisors (943644023).

4238399665 is a wasteful number, since it uses less digits than its factorization.

4238399665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994019.

The product of its digits is 8398080, while the sum is 55.

The square root of 4238399665 is about 65102.9927499497. The cubic root of 4238399665 is about 1618.3308094209.

The spelling of 4238399665 in words is "four billion, two hundred thirty-eight million, three hundred ninety-nine thousand, six hundred sixty-five".