1144538140 has 12 divisors (see below), whose sum is σ = 2403530136. Its totient is φ = 457815248.

The previous prime is 1144538137. The next prime is 1144538149. The reversal of 1144538140 is 418354411.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144538149) 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, 28613434 + ... + 28613473.

It is an arithmetic number, because the mean of its divisors is an integer number (200294178).

Almost surely, 2^1144538140 is an apocalyptic number.

1144538140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144538140 is an abundant number, since it is smaller than the sum of its proper divisors (1258991996).

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

1144538140 is a wasteful number, since it uses less digits than its factorization.

1144538140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57226916 (or 57226914 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1144538140 is about 33831.0233365767. The cubic root of 1144538140 is about 1046.0282728984.

The spelling of 1144538140 in words is "one billion, one hundred forty-four million, five hundred thirty-eight thousand, one hundred forty".