1138877887 has 4 divisors (see below), whose sum is σ = 1301574736. Its totient is φ = 976181040.

The previous prime is 1138877863. The next prime is 1138877921. The reversal of 1138877887 is 7887788311.

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

It is a cyclic number.

It is not a de Polignac number, because 1138877887 - 2¹¹ = 1138875839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138877807) 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 in 3 ways as a sum of consecutive naturals, for example, 81348414 + ... + 81348427.

It is an arithmetic number, because the mean of its divisors is an integer number (325393684).

Almost surely, 2^1138877887 is an apocalyptic number.

1138877887 is a deficient number, since it is larger than the sum of its proper divisors (162696849).

1138877887 is an equidigital number, since it uses as much as digits as its factorization.

1138877887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162696848.

The product of its digits is 4214784, while the sum is 58.

The square root of 1138877887 is about 33747.2648817649. The cubic root of 1138877887 is about 1044.3010632707.

The spelling of 1138877887 in words is "one billion, one hundred thirty-eight million, eight hundred seventy-seven thousand, eight hundred eighty-seven".