1139855220 has 384 divisors, whose sum is σ = 4354560000. Its totient is φ = 241740288.

The previous prime is 1139855209. The next prime is 1139855243. The reversal of 1139855220 is 225589311.

1139855220 is a `hidden beast` number, since 1 + 13 + 98 + 552 + 2 + 0 = 666.

It is a super-2 number, since 2×1139855220² = 2598539845122496800, which contains 22 as substring.

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

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 4237246 + ... + 4237514.

It is an arithmetic number, because the mean of its divisors is an integer number (11340000).

Almost surely, 2^1139855220 is an apocalyptic number.

1139855220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1139855220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2177280000).

1139855220 is an abundant number, since it is smaller than the sum of its proper divisors (3214704780).

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

1139855220 is a wasteful number, since it uses less digits than its factorization.

1139855220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1139855220 is about 33761.7419574287. The cubic root of 1139855220 is about 1044.5997016905.

The spelling of 1139855220 in words is "one billion, one hundred thirty-nine million, eight hundred fifty-five thousand, two hundred twenty".