39473921689 has 4 divisors (see below), whose sum is σ = 39674297124. Its totient is φ = 39273546256.

The previous prime is 39473921671. The next prime is 39473921717. The reversal of 39473921689 is 98612937493.

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 31779123289 + 7694798400 = 178267^2 + 87720^2 .

It is a cyclic number.

It is not a de Polignac number, because 39473921689 - 2¹³ = 39473913497 is a prime.

It is a super-2 number, since 2×39473921689² (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 (39473921629) 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, 100187422 + ... + 100187815.

It is an arithmetic number, because the mean of its divisors is an integer number (9918574281).

Almost surely, 2^39473921689 is an apocalyptic number.

It is an amenable number.

39473921689 is a deficient number, since it is larger than the sum of its proper divisors (200375435).

39473921689 is a wasteful number, since it uses less digits than its factorization.

39473921689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200375434.

The product of its digits is 17635968, while the sum is 61.

The spelling of 39473921689 in words is "thirty-nine billion, four hundred seventy-three million, nine hundred twenty-one thousand, six hundred eighty-nine".