4388665009 has 9 divisors (see below), whose sum is σ = 4536924651. Its totient is φ = 4245107760.

The previous prime is 4388665003. The next prime is 4388665013. The reversal of 4388665009 is 9005668834.

It is a happy number.

The square root of 4388665009 is 66247.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 198951025 + 4189713984 = 14105^2 + 64728^2 .

It is not a de Polignac number, because 4388665009 - 2¹¹ = 4388662961 is a prime.

It is a super-2 number, since 2×4388665009² = 38520761122441940162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4388665003) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2052589 + ... + 2054725.

It is an arithmetic number, because the mean of its divisors is an integer number (504102739).

Almost surely, 2^4388665009 is an apocalyptic number.

4388665009 is the 66247-th square number.

4388665009 is the 33124-th centered octagonal number.

It is an amenable number.

4388665009 is a deficient number, since it is larger than the sum of its proper divisors (148259642).

4388665009 is an frugal number, since it uses more digits than its factorization.

4388665009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The cubic root of 4388665009 is about 1637.2342100628.

Multiplying 4388665009 by its sum of digits (49), we get a square (215044585441 = 463729²).

The spelling of 4388665009 in words is "four billion, three hundred eighty-eight million, six hundred sixty-five thousand, nine".