1145043220 has 12 divisors (see below), whose sum is σ = 2404590804. Its totient is φ = 458017280.

The previous prime is 1145043209. The next prime is 1145043223. The reversal of 1145043220 is 223405411.

It can be written as a sum of positive squares in 2 ways, for example, as 126922756 + 1018120464 = 11266^2 + 31908^2 .

It is a super-2 number, since 2×1145043220² = 2622247951335936800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1145043191 and 1145043200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145043223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28626061 + ... + 28626100.

It is an arithmetic number, because the mean of its divisors is an integer number (200382567).

Almost surely, 2^1145043220 is an apocalyptic number.

1145043220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145043220 is an abundant number, since it is smaller than the sum of its proper divisors (1259547584).

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

1145043220 is a wasteful number, since it uses less digits than its factorization.

1145043220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57252170 (or 57252168 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1145043220 is about 33838.4872593324. The cubic root of 1145043220 is about 1046.1821196029.

Adding to 1145043220 its reverse (223405411), we get a palindrome (1368448631).

The spelling of 1145043220 in words is "one billion, one hundred forty-five million, forty-three thousand, two hundred twenty".