39994294789 has 4 divisors (see below), whose sum is σ = 40309210624. Its totient is φ = 39679378956.

The previous prime is 39994294787. The next prime is 39994294799. The reversal of 39994294789 is 98749249993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39994294789 - 2¹ = 39994294787 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 (39994294787) 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, 157457727 + ... + 157457980.

It is an arithmetic number, because the mean of its divisors is an integer number (10077302656).

Almost surely, 2^39994294789 is an apocalyptic number.

It is an amenable number.

39994294789 is a deficient number, since it is larger than the sum of its proper divisors (314915835).

39994294789 is a wasteful number, since it uses less digits than its factorization.

39994294789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314915834.

The product of its digits is 317447424, while the sum is 73.

The spelling of 39994294789 in words is "thirty-nine billion, nine hundred ninety-four million, two hundred ninety-four thousand, seven hundred eighty-nine".