39220346881 has 4 divisors (see below), whose sum is σ = 39624680452. Its totient is φ = 38816013312.

The previous prime is 39220346813. The next prime is 39220346903. The reversal of 39220346881 is 18864302293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18864302293 = 17401 ⋅1084093.

It can be written as a sum of positive squares in 2 ways, for example, as 7955034481 + 31265312400 = 89191^2 + 176820^2 .

It is a cyclic number.

It is not a de Polignac number, because 39220346881 - 2²⁹ = 38683475969 is a prime.

It is a super-2 number, since 2×39220346881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39220346681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202166640 + ... + 202166833.

It is an arithmetic number, because the mean of its divisors is an integer number (9906170113).

Almost surely, 2^39220346881 is an apocalyptic number.

It is an amenable number.

39220346881 is a deficient number, since it is larger than the sum of its proper divisors (404333571).

39220346881 is an equidigital number, since it uses as much as digits as its factorization.

39220346881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404333570.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 39220346881 in words is "thirty-nine billion, two hundred twenty million, three hundred forty-six thousand, eight hundred eighty-one".