39657249493 has 8 divisors (see below), whose sum is σ = 40038092600. Its totient is φ = 39276715968.

The previous prime is 39657249487. The next prime is 39657249547. The reversal of 39657249493 is 39494275693.

It can be written as a sum of positive squares in 4 ways, for example, as 8824347844 + 30832901649 = 93938^2 + 175593^2 .

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 39657249493 - 2¹³ = 39657241301 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 (39657249403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184255 + ... + 336547.

It is an arithmetic number, because the mean of its divisors is an integer number (5004761575).

Almost surely, 2^39657249493 is an apocalyptic number.

It is an amenable number.

39657249493 is a deficient number, since it is larger than the sum of its proper divisors (380843107).

39657249493 is a wasteful number, since it uses less digits than its factorization.

39657249493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154791.

The product of its digits is 44089920, while the sum is 61.

The spelling of 39657249493 in words is "thirty-nine billion, six hundred fifty-seven million, two hundred forty-nine thousand, four hundred ninety-three".