39973004557 has 4 divisors (see below), whose sum is σ = 39973433920. Its totient is φ = 39972575196.

The previous prime is 39973004527. The next prime is 39973004567. The reversal of 39973004557 is 75540037993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39973004557 is a prime.

It is the 199933-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39973004527) by changing a digit.

It is a nontrivial repunit in base 199932.

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, 9957 + ... + 282922.

It is an arithmetic number, because the mean of its divisors is an integer number (9993358480).

Almost surely, 2^39973004557 is an apocalyptic number.

It is an amenable number.

39973004557 is a deficient number, since it is larger than the sum of its proper divisors (429363).

39973004557 is a wasteful number, since it uses less digits than its factorization.

39973004557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429362.

The product of its (nonzero) digits is 3572100, while the sum is 52.

The spelling of 39973004557 in words is "thirty-nine billion, nine hundred seventy-three million, four thousand, five hundred fifty-seven".