39899852456689 has 3 divisors (see below), whose sum is σ = 39899858773323. Its totient is φ = 39899846140056.

The previous prime is 39899852456683. The next prime is 39899852456719. The reversal of 39899852456689 is 98665425899893.

The square root of 39899852456689 is 6316633.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 39231369615025 + 668482841664 = 6263495^2 + 817608^2 .

It is not a de Polignac number, because 39899852456689 - 2³¹ = 39897704973041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39899852456683) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3158317 + ... + 9474949.

It is an arithmetic number, because the mean of its divisors is an integer number (13299952924441).

Almost surely, 2^{39899852456689} is an apocalyptic number.

39899852456689 is the 6316633-rd square number.

39899852456689 is the 3158317-th centered octagonal number.

It is an amenable number.

39899852456689 is a deficient number, since it is larger than the sum of its proper divisors (6316634).

39899852456689 is an frugal number, since it uses more digits than its factorization.

39899852456689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633266 (or 6316633 counting only the distinct ones).

The product of its digits is 72559411200, while the sum is 91.

The spelling of 39899852456689 in words is "thirty-nine trillion, eight hundred ninety-nine billion, eight hundred fifty-two million, four hundred fifty-six thousand, six hundred eighty-nine".