3869959681 has 9 divisors (see below), whose sum is σ = 4502296449. Its totient is φ = 3316735044.

The previous prime is 3869959673. The next prime is 3869959693. The reversal of 3869959681 is 1869599683.

It is a happy number.

The square root of 3869959681 is 62209.

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

It is not a de Polignac number, because 3869959681 - 2³ = 3869959673 is a prime.

It is a super-2 number, since 2×3869959681² = 29953175865131243522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3869959661) 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, 431020 + ... + 439906.

It is an arithmetic number, because the mean of its divisors is an integer number (500255161).

Almost surely, 2^3869959681 is an apocalyptic number.

3869959681 is the 62209-th square number.

3869959681 is the 31105-th centered octagonal number.

It is an amenable number.

3869959681 is a deficient number, since it is larger than the sum of its proper divisors (632336768).

3869959681 is an frugal number, since it uses more digits than its factorization.

3869959681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17788 (or 8894 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 64.

The cubic root of 3869959681 is about 1570.0090173526.

Multiplying 3869959681 by its sum of digits (64), we get a square (247677419584 = 497672²).

The spelling of 3869959681 in words is "three billion, eight hundred sixty-nine million, nine hundred fifty-nine thousand, six hundred eighty-one".