1145421240 has 128 divisors (see below), whose sum is σ = 3649536000. Its totient is φ = 286599168.

The previous prime is 1145421239. The next prime is 1145421293. The reversal of 1145421240 is 421245411.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1145421240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 894921 + ... + 896199.

It is an arithmetic number, because the mean of its divisors is an integer number (28512000).

Almost surely, 2^1145421240 is an apocalyptic number.

1145421240 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 1145421240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824768000).

1145421240 is an abundant number, since it is smaller than the sum of its proper divisors (2504114760).

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

1145421240 is a wasteful number, since it uses less digits than its factorization.

1145421240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1145421240 is about 33844.0724499875. The cubic root of 1145421240 is about 1046.2972343995.

Adding to 1145421240 its reverse (421245411), we get a palindrome (1566666651).

The spelling of 1145421240 in words is "one billion, one hundred forty-five million, four hundred twenty-one thousand, two hundred forty".