1188780138 has 120 divisors (see below), whose sum is σ = 3297004128. Its totient is φ = 313473888.

The previous prime is 1188780137. The next prime is 1188780167. The reversal of 1188780138 is 8310878811.

It is a junction number, because it is equal to n+sod(n) for n = 1188780093 and 1188780102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188780137) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 188545 + ... + 194747.

Almost surely, 2^1188780138 is an apocalyptic number.

1188780138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1188780138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1648502064).

1188780138 is an abundant number, since it is smaller than the sum of its proper divisors (2108223990).

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

1188780138 is a wasteful number, since it uses less digits than its factorization.

1188780138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250 (or 6228 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 45.

The square root of 1188780138 is about 34478.6910714430. The cubic root of 1188780138 is about 1059.3362814262.

The spelling of 1188780138 in words is "one billion, one hundred eighty-eight million, seven hundred eighty thousand, one hundred thirty-eight".