39891814394029 has 8 divisors (see below), whose sum is σ = 42960491332920. Its totient is φ = 36823148288256.

The previous prime is 39891814394011. The next prime is 39891814394041. The reversal of 39891814394029 is 92049341819893.

It can be written as a sum of positive squares in 4 ways, for example, as 14368079775625 + 25523734618404 = 3790525^2 + 5052102^2 .

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 39891814394029 - 2¹⁷ = 39891814262957 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 (39891814394629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5969649 + ... + 10743385.

It is an arithmetic number, because the mean of its divisors is an integer number (5370061416615).

Almost surely, 2^{39891814394029} is an apocalyptic number.

It is an amenable number.

39891814394029 is a deficient number, since it is larger than the sum of its proper divisors (3068676938891).

39891814394029 is a wasteful number, since it uses less digits than its factorization.

39891814394029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416559.

The product of its (nonzero) digits is 120932352, while the sum is 70.

The spelling of 39891814394029 in words is "thirty-nine trillion, eight hundred ninety-one billion, eight hundred fourteen million, three hundred ninety-four thousand, twenty-nine".