39854931769 has 3 divisors (see below), whose sum is σ = 39855131407. Its totient is φ = 39854732132.

The previous prime is 39854931763. The next prime is 39854931793. The reversal of 39854931769 is 96713945893.

The square root of 39854931769 is 199637.

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., 3378515625 + 36476416144 = 58125^2 + 190988^2 .

It is not a de Polignac number, because 39854931769 - 2³⁵ = 5495193401 is a prime.

It is a super-2 number, since 2×39854931769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39854931769.

It is not an unprimeable number, because it can be changed into a prime (39854931763) 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, 99819 + ... + 299455.

Almost surely, 2^39854931769 is an apocalyptic number.

39854931769 is the 199637-th square number.

39854931769 is the 99819-th centered octagonal number.

It is an amenable number.

39854931769 is a deficient number, since it is larger than the sum of its proper divisors (199638).

39854931769 is an frugal number, since it uses more digits than its factorization.

39854931769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399274 (or 199637 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 64.

Multiplying 39854931769 by its sum of digits (64), we get a square (2550715633216 = 1597096²).

The spelling of 39854931769 in words is "thirty-nine billion, eight hundred fifty-four million, nine hundred thirty-one thousand, seven hundred sixty-nine".