1138877550 has 48 divisors (see below), whose sum is σ = 3138244080. Its totient is φ = 303700320.

The previous prime is 1138877533. The next prime is 1138877557. The reversal of 1138877550 is 557788311.

1138877550 is a `hidden beast` number, since 1 + 13 + 8 + 87 + 7 + 550 = 666.

1138877550 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1138877496 and 1138877505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138877557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 420457 + ... + 423156.

It is an arithmetic number, because the mean of its divisors is an integer number (65380085).

Almost surely, 2^1138877550 is an apocalyptic number.

1138877550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1138877550 is an abundant number, since it is smaller than the sum of its proper divisors (1999366530).

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

1138877550 is a wasteful number, since it uses less digits than its factorization.

1138877550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843634 (or 843623 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 45.

The square root of 1138877550 is about 33747.2598887673. The cubic root of 1138877550 is about 1044.3009602660.

The spelling of 1138877550 in words is "one billion, one hundred thirty-eight million, eight hundred seventy-seven thousand, five hundred fifty".