39391309394 has 8 divisors (see below), whose sum is σ = 59896374780. Its totient is φ = 19425851136.

The previous prime is 39391309393. The next prime is 39391309403. The reversal of 39391309394 is 49390319393.

It can be written as a sum of positive squares in 2 ways, for example, as 36242640625 + 3148668769 = 190375^2 + 56113^2 .

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

It is not an unprimeable number, because it can be changed into a prime (39391309393) 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, 134901599 + ... + 134901890.

Almost surely, 2^39391309394 is an apocalyptic number.

39391309394 is a deficient number, since it is larger than the sum of its proper divisors (20505065386).

39391309394 is a wasteful number, since it uses less digits than its factorization.

39391309394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269803564.

The product of its (nonzero) digits is 2125764, while the sum is 53.

Subtracting 39391309394 from its reverse (49390319393), we obtain a palindrome (9999009999).

The spelling of 39391309394 in words is "thirty-nine billion, three hundred ninety-one million, three hundred nine thousand, three hundred ninety-four".