1145431320 has 128 divisors (see below), whose sum is σ = 3800355840. Its totient is φ = 273853440.

The previous prime is 1145431319. The next prime is 1145431327. The reversal of 1145431320 is 231345411.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145431327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90417 + ... + 102303.

It is an arithmetic number, because the mean of its divisors is an integer number (29690280).

Almost surely, 2^1145431320 is an apocalyptic number.

1145431320 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 1145431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1900177920).

1145431320 is an abundant number, since it is smaller than the sum of its proper divisors (2654924520).

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

1145431320 is a wasteful number, since it uses less digits than its factorization.

1145431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11985 (or 11981 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1145431320 is about 33844.2213679086. The cubic root of 1145431320 is about 1046.3003036183.

Adding to 1145431320 its reverse (231345411), we get a palindrome (1376776731).

The spelling of 1145431320 in words is "one billion, one hundred forty-five million, four hundred thirty-one thousand, three hundred twenty".