3813881556 has 12 divisors (see below), whose sum is σ = 8899056992. Its totient is φ = 1271293848.

The previous prime is 3813881527. The next prime is 3813881563. The reversal of 3813881556 is 6551883183.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×3813881556² = 29091385046393962272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 158911720 + ... + 158911743.

Almost surely, 2^3813881556 is an apocalyptic number.

It is an amenable number.

3813881556 is an abundant number, since it is smaller than the sum of its proper divisors (5085175436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3813881556 is a wasteful number, since it uses less digits than its factorization.

3813881556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317823470 (or 317823468 counting only the distinct ones).

The product of its digits is 691200, while the sum is 48.

The square root of 3813881556 is about 61756.6316762823. The cubic root of 3813881556 is about 1562.3886205066.

The spelling of 3813881556 in words is "three billion, eight hundred thirteen million, eight hundred eighty-one thousand, five hundred fifty-six".