144138293 has 4 divisors (see below), whose sum is σ = 155225868. Its totient is φ = 133050720.

The previous prime is 144138233. The next prime is 144138299. The reversal of 144138293 is 392831441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5793649 + 138344644 = 2407^2 + 11762^2 .

It is a cyclic number.

It is not a de Polignac number, because 144138293 - 2⁶ = 144138229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144138299) 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, 5543768 + ... + 5543793.

It is an arithmetic number, because the mean of its divisors is an integer number (38806467).

Almost surely, 2^144138293 is an apocalyptic number.

144138293 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

144138293 is a deficient number, since it is larger than the sum of its proper divisors (11087575).

144138293 is a wasteful number, since it uses less digits than its factorization.

144138293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11087574.

The product of its digits is 20736, while the sum is 35.

The square root of 144138293 is about 12005.7608255370. The cubic root of 144138293 is about 524.3160169109.

The spelling of 144138293 in words is "one hundred forty-four million, one hundred thirty-eight thousand, two hundred ninety-three".