39987684193 has 4 divisors (see below), whose sum is σ = 39988981188. Its totient is φ = 39986387200.

The previous prime is 39987684179. The next prime is 39987684197. The reversal of 39987684193 is 39148678993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39148678993 = 211 ⋅185538763.

It can be written as a sum of positive squares in 2 ways, for example, as 31644140544 + 8343543649 = 177888^2 + 91343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39987684193 is a prime.

It is a super-2 number, since 2×39987684193² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39987684197) 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 3 ways as a sum of consecutive naturals, for example, 601096 + ... + 664297.

It is an arithmetic number, because the mean of its divisors is an integer number (9997245297).

Almost surely, 2^39987684193 is an apocalyptic number.

It is an amenable number.

39987684193 is a deficient number, since it is larger than the sum of its proper divisors (1296995).

39987684193 is a wasteful number, since it uses less digits than its factorization.

39987684193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296994.

The product of its digits is 70543872, while the sum is 67.

The spelling of 39987684193 in words is "thirty-nine billion, nine hundred eighty-seven million, six hundred eighty-four thousand, one hundred ninety-three".