39920003781 has 8 divisors (see below), whose sum is σ = 60830481984. Its totient is φ = 22811430720.

The previous prime is 39920003681. The next prime is 39920003867. The reversal of 39920003781 is 18730002993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39920003781 - 2¹⁰ = 39920002757 is a prime.

It is a super-2 number, since 2×39920003781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39920003281) 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, 950476260 + ... + 950476301.

It is an arithmetic number, because the mean of its divisors is an integer number (7603810248).

Almost surely, 2^39920003781 is an apocalyptic number.

It is an amenable number.

39920003781 is a deficient number, since it is larger than the sum of its proper divisors (20910478203).

39920003781 is a wasteful number, since it uses less digits than its factorization.

39920003781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900952571.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 39920003781 in words is "thirty-nine billion, nine hundred twenty million, three thousand, seven hundred eighty-one".