144136442 has 4 divisors (see below), whose sum is σ = 216204666. Its totient is φ = 72068220.

The previous prime is 144136441. The next prime is 144136457. The reversal of 144136442 is 244631441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244631441 = 19 ⋅12875339.

It can be written as a sum of positive squares in only one way, i.e., 140446201 + 3690241 = 11851^2 + 1921^2 .

It is not an unprimeable number, because it can be changed into a prime (144136441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36034109 + ... + 36034112.

Almost surely, 2^144136442 is an apocalyptic number.

144136442 is a deficient number, since it is larger than the sum of its proper divisors (72068224).

144136442 is an equidigital number, since it uses as much as digits as its factorization.

144136442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72068223.

The product of its digits is 9216, while the sum is 29.

The square root of 144136442 is about 12005.6837372971. The cubic root of 144136442 is about 524.3137725083.

Adding to 144136442 its reverse (244631441), we get a palindrome (388767883).

The spelling of 144136442 in words is "one hundred forty-four million, one hundred thirty-six thousand, four hundred forty-two".