1138885538 has 30 divisors (see below), whose sum is σ = 1997031771. Its totient is φ = 487091556.

The previous prime is 1138885537. The next prime is 1138885541. The reversal of 1138885538 is 8355888311.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 569442769 + 569442769 = 23863^2 + 23863^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=23863.

It is not an unprimeable number, because it can be changed into a prime (1138885537) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2338331 + ... + 2338817.

Almost surely, 2^1138885538 is an apocalyptic number.

1138885538 is a deficient number, since it is larger than the sum of its proper divisors (858146233).

1138885538 is an frugal number, since it uses more digits than its factorization.

1138885538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 496 counting only the distinct ones).

The product of its digits is 921600, while the sum is 50.

The square root of 1138885538 is about 33747.3782389092. The cubic root of 1138885538 is about 1044.3034018093.

Multiplying 1138885538 by its sum of digits (50), we get a square (56944276900 = 238630²).

The spelling of 1138885538 in words is "one billion, one hundred thirty-eight million, eight hundred eighty-five thousand, five hundred thirty-eight".