1144395840 has 224 divisors, whose sum is σ = 4371563520. Its totient is φ = 247781376.

The previous prime is 1144395839. The next prime is 1144395871. The reversal of 1144395840 is 485934411.

It is a tau number, because it is divible by the number of its divisors (224).

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, 123199 + ... + 132161.

Almost surely, 2^1144395840 is an apocalyptic number.

1144395840 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 1144395840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2185781760).

1144395840 is an abundant number, since it is smaller than the sum of its proper divisors (3227167680).

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

1144395840 is a wasteful number, since it uses less digits than its factorization.

1144395840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9009 (or 8999 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1144395840 is about 33828.9201719476. The cubic root of 1144395840 is about 1045.9849203334.

The spelling of 1144395840 in words is "one billion, one hundred forty-four million, three hundred ninety-five thousand, eight hundred forty".