39994049993 has 4 divisors (see below), whose sum is σ = 40390030788. Its totient is φ = 39598069200.

The previous prime is 39994049989. The next prime is 39994049999.

It is a happy number.

39994049993 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16903120144 + 23090929849 = 130012^2 + 151957^2 .

It is a cyclic number.

It is not a de Polignac number, because 39994049993 - 2² = 39994049989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39994049999) 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 3 ways as a sum of consecutive naturals, for example, 197990246 + ... + 197990447.

It is an arithmetic number, because the mean of its divisors is an integer number (10097507697).

Almost surely, 2^39994049993 is an apocalyptic number.

It is an amenable number.

39994049993 is a deficient number, since it is larger than the sum of its proper divisors (395980795).

39994049993 is a wasteful number, since it uses less digits than its factorization.

39994049993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395980794.

The product of its (nonzero) digits is 76527504, while the sum is 68.

The spelling of 39994049993 in words is "thirty-nine billion, nine hundred ninety-four million, forty-nine thousand, nine hundred ninety-three".