39920003681 has 2 divisors, whose sum is σ = 39920003682. Its totient is φ = 39920003680.

The previous prime is 39920003677. The next prime is 39920003867. The reversal of 39920003681 is 18630002993.

39920003681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32297840656 + 7622163025 = 179716^2 + 87305^2 .

It is a cyclic number.

It is not a de Polignac number, because 39920003681 - 2² = 39920003677 is a prime.

It is a super-2 number, since 2×39920003681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39920003671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19960001840 + 19960001841.

It is an arithmetic number, because the mean of its divisors is an integer number (19960001841).

Almost surely, 2^39920003681 is an apocalyptic number.

It is an amenable number.

39920003681 is a deficient number, since it is larger than the sum of its proper divisors (1).

39920003681 is an equidigital number, since it uses as much as digits as its factorization.

39920003681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 39920003681 in words is "thirty-nine billion, nine hundred twenty million, three thousand, six hundred eighty-one".