1144155220 has 48 divisors (see below), whose sum is σ = 2590067088. Its totient is φ = 422046720.

The previous prime is 1144155203. The next prime is 1144155227. The reversal of 1144155220 is 225514411.

It can be written as a sum of positive squares in 8 ways, for example, as 35664784 + 1108490436 = 5972^2 + 33294^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144155227) 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, 446182 + ... + 448738.

It is an arithmetic number, because the mean of its divisors is an integer number (53959731).

Almost surely, 2^1144155220 is an apocalyptic number.

1144155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144155220 is an abundant number, since it is smaller than the sum of its proper divisors (1445911868).

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

1144155220 is a wasteful number, since it uses less digits than its factorization.

1144155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300 (or 4298 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1144155220 is about 33825.3635605000. The cubic root of 1144155220 is about 1045.9116058023.

Adding to 1144155220 its reverse (225514411), we get a palindrome (1369669631).

The spelling of 1144155220 in words is "one billion, one hundred forty-four million, one hundred fifty-five thousand, two hundred twenty".