3924740137681 has 4 divisors (see below), whose sum is σ = 4281534695664. Its totient is φ = 3567945579700.

The previous prime is 3924740137663. The next prime is 3924740137687. The reversal of 3924740137681 is 1867310474293.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3924740137681 - 2⁷ = 3924740137553 is a prime.

It is a super-2 number, since 2×3924740137681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3924740137687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178397278975 + ... + 178397278996.

It is an arithmetic number, because the mean of its divisors is an integer number (1070383673916).

Almost surely, 2^{3924740137681} is an apocalyptic number.

It is an amenable number.

3924740137681 is a deficient number, since it is larger than the sum of its proper divisors (356794557983).

3924740137681 is a wasteful number, since it uses less digits than its factorization.

3924740137681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356794557982.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 3924740137681 in words is "three trillion, nine hundred twenty-four billion, seven hundred forty million, one hundred thirty-seven thousand, six hundred eighty-one".