39920129429 has 8 divisors (see below), whose sum is σ = 41952519840. Its totient is φ = 37937921616.

The previous prime is 39920129387. The next prime is 39920129467. The reversal of 39920129429 is 92492102993.

It is a happy number.

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 39920129429 - 2⁸ = 39920129173 is a prime.

It is a super-2 number, since 2×39920129429² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39920123429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12544019 + ... + 12547200.

It is an arithmetic number, because the mean of its divisors is an integer number (5244064980).

Almost surely, 2^39920129429 is an apocalyptic number.

It is an amenable number.

39920129429 is a deficient number, since it is larger than the sum of its proper divisors (2032390411).

39920129429 is a wasteful number, since it uses less digits than its factorization.

39920129429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25091299.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 39920129429 in words is "thirty-nine billion, nine hundred twenty million, one hundred twenty-nine thousand, four hundred twenty-nine".