1144397920 has 24 divisors (see below), whose sum is σ = 2703640464. Its totient is φ = 457759104.

The previous prime is 1144397909. The next prime is 1144397923. The reversal of 1144397920 is 297934411.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144397923) 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, 3576084 + ... + 3576403.

It is an arithmetic number, because the mean of its divisors is an integer number (112651686).

Almost surely, 2^1144397920 is an apocalyptic number.

1144397920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144397920 is an abundant number, since it is smaller than the sum of its proper divisors (1559242544).

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

1144397920 is an equidigital number, since it uses as much as digits as its factorization.

1144397920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152502 (or 7152494 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1144397920 is about 33828.9509148599. The cubic root of 1144397920 is about 1045.9855540440.

The spelling of 1144397920 in words is "one billion, one hundred forty-four million, three hundred ninety-seven thousand, nine hundred twenty".