39729509423 has 4 divisors (see below), whose sum is σ = 39895741920. Its totient is φ = 39563276928.

The previous prime is 39729509419. The next prime is 39729509453. The reversal of 39729509423 is 32490592793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32490592793 = 71 ⋅457613983.

It is a cyclic number.

It is not a de Polignac number, because 39729509423 - 2² = 39729509419 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 (39729509453) 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, 83115890 + ... + 83116367.

It is an arithmetic number, because the mean of its divisors is an integer number (9973935480).

Almost surely, 2^39729509423 is an apocalyptic number.

39729509423 is a deficient number, since it is larger than the sum of its proper divisors (166232497).

39729509423 is a wasteful number, since it uses less digits than its factorization.

39729509423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166232496.

The product of its (nonzero) digits is 3674160, while the sum is 53.

The spelling of 39729509423 in words is "thirty-nine billion, seven hundred twenty-nine million, five hundred nine thousand, four hundred twenty-three".