3988354913981 has 4 divisors (see below), whose sum is σ = 3988885076352. Its totient is φ = 3987824751612.

The previous prime is 3988354913971. The next prime is 3988354913987. The reversal of 3988354913981 is 1893194538893.

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 3988354913981 - 2³⁰ = 3987281172157 is a prime.

It is a super-2 number, since 2×3988354913981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988354913987) 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, 265069901 + ... + 265084946.

It is an arithmetic number, because the mean of its divisors is an integer number (997221269088).

Almost surely, 2^{3988354913981} is an apocalyptic number.

It is an amenable number.

3988354913981 is a deficient number, since it is larger than the sum of its proper divisors (530162371).

3988354913981 is an equidigital number, since it uses as much as digits as its factorization.

3988354913981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530162370.

The product of its digits is 201553920, while the sum is 71.

The spelling of 3988354913981 in words is "three trillion, nine hundred eighty-eight billion, three hundred fifty-four million, nine hundred thirteen thousand, nine hundred eighty-one".