1139555280 has 80 divisors (see below), whose sum is σ = 3563968320. Its totient is φ = 301185024.

The previous prime is 1139555273. The next prime is 1139555281. The reversal of 1139555280 is 825559311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139555281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6111 + ... + 48129.

It is an arithmetic number, because the mean of its divisors is an integer number (44549604).

Almost surely, 2^1139555280 is an apocalyptic number.

1139555280 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 1139555280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1781984160).

1139555280 is an abundant number, since it is smaller than the sum of its proper divisors (2424413040).

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

1139555280 is a wasteful number, since it uses less digits than its factorization.

1139555280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42148 (or 42142 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 1139555280 is about 33757.2996550376. The cubic root of 1139555280 is about 1044.5080687898.

The spelling of 1139555280 in words is "one billion, one hundred thirty-nine million, five hundred fifty-five thousand, two hundred eighty".