39704721917 has 4 divisors (see below), whose sum is σ = 45376825056. Its totient is φ = 34032618780.

The previous prime is 39704721883. The next prime is 39704721923. The reversal of 39704721917 is 71912740793.

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.

It is a cyclic number.

It is not a de Polignac number, because 39704721917 - 2²⁴ = 39687944701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39704721937) 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, 2836051559 + ... + 2836051572.

It is an arithmetic number, because the mean of its divisors is an integer number (11344206264).

Almost surely, 2^39704721917 is an apocalyptic number.

It is an amenable number.

39704721917 is a deficient number, since it is larger than the sum of its proper divisors (5672103139).

39704721917 is an equidigital number, since it uses as much as digits as its factorization.

39704721917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672103138.

The product of its (nonzero) digits is 666792, while the sum is 50.

The spelling of 39704721917 in words is "thirty-nine billion, seven hundred four million, seven hundred twenty-one thousand, nine hundred seventeen".