39731309797973 has 8 divisors (see below), whose sum is σ = 43205430687192. Its totient is φ = 36383520577536.

The previous prime is 39731309797969. The next prime is 39731309797979. The reversal of 39731309797973 is 37979790313793.

It can be written as a sum of positive squares in 4 ways, for example, as 5905011780529 + 33826298017444 = 2430023^2 + 5816038^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39731309797973 - 2² = 39731309797969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39731309797894 and 39731309797903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39731309797979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31582916540 + ... + 31582917797.

It is an arithmetic number, because the mean of its divisors is an integer number (5400678835899).

Almost surely, 2^{39731309797973} is an apocalyptic number.

It is an amenable number.

39731309797973 is a deficient number, since it is larger than the sum of its proper divisors (3474120889219).

39731309797973 is a wasteful number, since it uses less digits than its factorization.

39731309797973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63165834391.

The product of its (nonzero) digits is 1275989841, while the sum is 77.

The spelling of 39731309797973 in words is "thirty-nine trillion, seven hundred thirty-one billion, three hundred nine million, seven hundred ninety-seven thousand, nine hundred seventy-three".