39981882769 has 4 divisors (see below), whose sum is σ = 42333758244. Its totient is φ = 37630007296.

The previous prime is 39981882749. The next prime is 39981882781. The reversal of 39981882769 is 96728818993.

39981882769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25412185744 + 14569697025 = 159412^2 + 120705^2 .

It is a cyclic number.

It is not a de Polignac number, because 39981882769 - 2²⁵ = 39948328337 is a prime.

It is a super-2 number, since 2×39981882769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39981882698 and 39981882707.

It is not an unprimeable number, because it can be changed into a prime (39981882749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175937712 + ... + 1175937745.

It is an arithmetic number, because the mean of its divisors is an integer number (10583439561).

Almost surely, 2^39981882769 is an apocalyptic number.

It is an amenable number.

39981882769 is a deficient number, since it is larger than the sum of its proper divisors (2351875475).

39981882769 is a wasteful number, since it uses less digits than its factorization.

39981882769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351875474.

The product of its digits is 94058496, while the sum is 70.

The spelling of 39981882769 in words is "thirty-nine billion, nine hundred eighty-one million, eight hundred eighty-two thousand, seven hundred sixty-nine".