39954065405 has 4 divisors (see below), whose sum is σ = 47944878492. Its totient is φ = 31963252320.

The previous prime is 39954065383. The next prime is 39954065407. The reversal of 39954065405 is 50456045993.

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 29681432089 + 10272633316 = 172283^2 + 101354^2 .

It is a de Polignac number, because none of the positive numbers 2^k-39954065405 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 (39954065407) 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, 3995406536 + ... + 3995406545.

It is an arithmetic number, because the mean of its divisors is an integer number (11986219623).

Almost surely, 2^39954065405 is an apocalyptic number.

It is an amenable number.

39954065405 is a deficient number, since it is larger than the sum of its proper divisors (7990813087).

39954065405 is an equidigital number, since it uses as much as digits as its factorization.

39954065405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990813086.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 39954065405 in words is "thirty-nine billion, nine hundred fifty-four million, sixty-five thousand, four hundred five".