3868155638 has 8 divisors (see below), whose sum is σ = 5839190832. Its totient is φ = 1921758696.

The previous prime is 3868155637. The next prime is 3868155677. The reversal of 3868155638 is 8365518683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×3868155638³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3868155638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3868155637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6159170 + ... + 6159797.

It is an arithmetic number, because the mean of its divisors is an integer number (729898854).

Almost surely, 2^3868155638 is an apocalyptic number.

3868155638 is a deficient number, since it is larger than the sum of its proper divisors (1971035194).

3868155638 is a wasteful number, since it uses less digits than its factorization.

3868155638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12319126.

The product of its digits is 4147200, while the sum is 53.

The square root of 3868155638 is about 62194.4984544453. The cubic root of 3868155638 is about 1569.7650179105.

The spelling of 3868155638 in words is "three billion, eight hundred sixty-eight million, one hundred fifty-five thousand, six hundred thirty-eight".