1145242220 has 48 divisors (see below), whose sum is σ = 2567980800. Its totient is φ = 427982016.

The previous prime is 1145242211. The next prime is 1145242229. The reversal of 1145242220 is 222425411.

It is an interprime number because it is at equal distance from previous prime (1145242211) and next prime (1145242229).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (1145242229) 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, 9170 + ... + 48729.

It is an arithmetic number, because the mean of its divisors is an integer number (53499600).

Almost surely, 2^1145242220 is an apocalyptic number.

1145242220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145242220 is an abundant number, since it is smaller than the sum of its proper divisors (1422738580).

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

1145242220 is a wasteful number, since it uses less digits than its factorization.

1145242220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57974 (or 57972 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1145242220 is about 33841.4275703612. The cubic root of 1145242220 is about 1046.2427223174.

Adding to 1145242220 its reverse (222425411), we get a palindrome (1367667631).

The spelling of 1145242220 in words is "one billion, one hundred forty-five million, two hundred forty-two thousand, two hundred twenty".