39923775641 has 4 divisors (see below), whose sum is σ = 40018606884. Its totient is φ = 39828944400.

The previous prime is 39923775589. The next prime is 39923775673. The reversal of 39923775641 is 14657732993.

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 3549657241 + 36374118400 = 59579^2 + 190720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39923775641 is a prime.

It is a super-2 number, since 2×39923775641² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39923778641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47414990 + ... + 47415831.

It is an arithmetic number, because the mean of its divisors is an integer number (10004651721).

Almost surely, 2^39923775641 is an apocalyptic number.

It is an amenable number.

39923775641 is a deficient number, since it is larger than the sum of its proper divisors (94831243).

39923775641 is an equidigital number, since it uses as much as digits as its factorization.

39923775641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94831242.

The product of its digits is 8573040, while the sum is 56.

The spelling of 39923775641 in words is "thirty-nine billion, nine hundred twenty-three million, seven hundred seventy-five thousand, six hundred forty-one".