39717699849 has 9 divisors (see below), whose sum is σ = 57370874509. Its totient is φ = 26478067980.

The previous prime is 39717699817. The next prime is 39717699851. The reversal of 39717699849 is 94899671793.

The square root of 39717699849 is 199293.

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

39717699849 is a `hidden beast` number, since 397 + 1 + 76 + 99 + 84 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 39717699849 - 2⁵ = 39717699817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39717699649) 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, 564664 + ... + 631094.

Almost surely, 2^39717699849 is an apocalyptic number.

39717699849 is the 199293-rd square number.

39717699849 is the 99647-th centered octagonal number.

It is an amenable number.

39717699849 is a deficient number, since it is larger than the sum of its proper divisors (17653174660).

39717699849 is an frugal number, since it uses more digits than its factorization.

39717699849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132868 (or 66434 counting only the distinct ones).

The product of its digits is 185177664, while the sum is 72.

It can be divided in two parts, 397176 and 99849, that added together give a square (497025 = 705²).

The spelling of 39717699849 in words is "thirty-nine billion, seven hundred seventeen million, six hundred ninety-nine thousand, eight hundred forty-nine".