39955384909439 has 4 divisors (see below), whose sum is σ = 39959570043624. Its totient is φ = 39951199775256.

The previous prime is 39955384909423. The next prime is 39955384909481. The reversal of 39955384909439 is 93490948355993.

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

It is a cyclic number.

It is not a de Polignac number, because 39955384909439 - 2⁴ = 39955384909423 is a prime.

It is a super-2 number, since 2×39955384909439² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39955384909639) 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, 2092552772 + ... + 2092571865.

It is an arithmetic number, because the mean of its divisors is an integer number (9989892510906).

Almost surely, 2^{39955384909439} is an apocalyptic number.

39955384909439 is a deficient number, since it is larger than the sum of its proper divisors (4185134185).

39955384909439 is an equidigital number, since it uses as much as digits as its factorization.

39955384909439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185134184.

The product of its (nonzero) digits is 5101833600, while the sum is 80.

The spelling of 39955384909439 in words is "thirty-nine trillion, nine hundred fifty-five billion, three hundred eighty-four million, nine hundred nine thousand, four hundred thirty-nine".