1138642380 has 48 divisors (see below), whose sum is σ = 3542444640. Its totient is φ = 303637824.

The previous prime is 1138642363. The next prime is 1138642391. The reversal of 1138642380 is 832468311.

1138642380 is a `hidden beast` number, since 1 + 1 + 3 + 8 + 642 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1053759 + ... + 1054838.

It is an arithmetic number, because the mean of its divisors is an integer number (73800930).

Almost surely, 2^1138642380 is an apocalyptic number.

1138642380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138642380 is an abundant number, since it is smaller than the sum of its proper divisors (2403802260).

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

1138642380 is a wasteful number, since it uses less digits than its factorization.

1138642380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108615 (or 2108607 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1138642380 is about 33743.7754259952. The cubic root of 1138642380 is about 1044.2290751124.

The spelling of 1138642380 in words is "one billion, one hundred thirty-eight million, six hundred forty-two thousand, three hundred eighty".