39043521994 has 4 divisors (see below), whose sum is σ = 58565282994. Its totient is φ = 19521760996.

The previous prime is 39043521977. The next prime is 39043522019. The reversal of 39043521994 is 49912534093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26658725625 + 12384796369 = 163275^2 + 111287^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9760880497 + ... + 9760880500.

Almost surely, 2^39043521994 is an apocalyptic number.

39043521994 is a deficient number, since it is larger than the sum of its proper divisors (19521761000).

39043521994 is a wasteful number, since it uses less digits than its factorization.

39043521994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19521760999.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The spelling of 39043521994 in words is "thirty-nine billion, forty-three million, five hundred twenty-one thousand, nine hundred ninety-four".