3887993281 has 4 divisors (see below), whose sum is σ = 3916372932. Its totient is φ = 3859613632.

The previous prime is 3887993201. The next prime is 3887993297. The reversal of 3887993281 is 1823997883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1657792656 + 2230200625 = 40716^2 + 47225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3887993281 - 2¹⁵ = 3887960513 is a prime.

It is a super-2 number, since 2×3887993281² = 30232983506202289922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3887993201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14189620 + ... + 14189893.

It is an arithmetic number, because the mean of its divisors is an integer number (979093233).

Almost surely, 2^3887993281 is an apocalyptic number.

It is an amenable number.

3887993281 is a deficient number, since it is larger than the sum of its proper divisors (28379651).

3887993281 is a wasteful number, since it uses less digits than its factorization.

3887993281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28379650.

The product of its digits is 5225472, while the sum is 58.

The square root of 3887993281 is about 62353.7751944499. The cubic root of 3887993281 is about 1572.4439307243.

The spelling of 3887993281 in words is "three billion, eight hundred eighty-seven million, nine hundred ninety-three thousand, two hundred eighty-one".