3859499922721 has 3 divisors (see below), whose sum is σ = 3859501887283. Its totient is φ = 3859497958160.

The previous prime is 3859499922713. The next prime is 3859499922767. The reversal of 3859499922721 is 1272299949583.

The square root of 3859499922721 is 1964561.

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., 18683882721 + 3840816040000 = 136689^2 + 1959800^2 .

It is not a de Polignac number, because 3859499922721 - 2³ = 3859499922713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3859499922821) 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 2 ways as a sum of consecutive naturals, for example, 982281 + ... + 2946841.

Almost surely, 2^{3859499922721} is an apocalyptic number.

3859499922721 is the 1964561-st square number.

3859499922721 is the 982281-st centered octagonal number.

It is an amenable number.

3859499922721 is a deficient number, since it is larger than the sum of its proper divisors (1964562).

3859499922721 is an frugal number, since it uses more digits than its factorization.

3859499922721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929122 (or 1964561 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 70.

The spelling of 3859499922721 in words is "three trillion, eight hundred fifty-nine billion, four hundred ninety-nine million, nine hundred twenty-two thousand, seven hundred twenty-one".