3888216538 has 4 divisors (see below), whose sum is σ = 5832324810. Its totient is φ = 1944108268.

The previous prime is 3888216533. The next prime is 3888216547. The reversal of 3888216538 is 8356128883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8356128883 = 19 ⋅439796257.

It can be written as a sum of positive squares in only one way, i.e., 3245239089 + 642977449 = 56967^2 + 25357^2 .

It is not an unprimeable number, because it can be changed into a prime (3888216533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972054133 + ... + 972054136.

Almost surely, 2^3888216538 is an apocalyptic number.

3888216538 is a deficient number, since it is larger than the sum of its proper divisors (1944108272).

3888216538 is a wasteful number, since it uses less digits than its factorization.

3888216538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944108271.

The product of its digits is 2211840, while the sum is 52.

The square root of 3888216538 is about 62355.5654132011. The cubic root of 3888216538 is about 1572.4740278610.

The spelling of 3888216538 in words is "three billion, eight hundred eighty-eight million, two hundred sixteen thousand, five hundred thirty-eight".