39649459693 has 4 divisors (see below), whose sum is σ = 39703998880. Its totient is φ = 39594920508.

The previous prime is 39649459687. The next prime is 39649459739. The reversal of 39649459693 is 39695494693.

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 a de Polignac number, because none of the positive numbers 2^k-39649459693 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 (39649459613) 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, 27268503 + ... + 27269956.

It is an arithmetic number, because the mean of its divisors is an integer number (9925999720).

Almost surely, 2^39649459693 is an apocalyptic number.

It is an amenable number.

39649459693 is a deficient number, since it is larger than the sum of its proper divisors (54539187).

39649459693 is an equidigital number, since it uses as much as digits as its factorization.

39649459693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54539186.

The product of its digits is 170061120, while the sum is 67.

The spelling of 39649459693 in words is "thirty-nine billion, six hundred forty-nine million, four hundred fifty-nine thousand, six hundred ninety-three".