1139397220 has 24 divisors (see below), whose sum is σ = 2576791224. Its totient is φ = 420700416.

The previous prime is 1139397209. The next prime is 1139397251. The reversal of 1139397220 is 227939311.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23970816 + 1115426404 = 4896^2 + 33398^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1139397220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190889 + ... + 2191408.

It is an arithmetic number, because the mean of its divisors is an integer number (107366301).

Almost surely, 2^1139397220 is an apocalyptic number.

1139397220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1139397220 is an abundant number, since it is smaller than the sum of its proper divisors (1437394004).

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

1139397220 is a wasteful number, since it uses less digits than its factorization.

1139397220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382319 (or 4382317 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 1139397220 is about 33754.9584505743. The cubic root of 1139397220 is about 1044.4597743420.

The spelling of 1139397220 in words is "one billion, one hundred thirty-nine million, three hundred ninety-seven thousand, two hundred twenty".