142440321 has 16 divisors (see below), whose sum is σ = 201155840. Its totient is φ = 89404560.

The previous prime is 142440293. The next prime is 142440323. The reversal of 142440321 is 123044241.

It is not a de Polignac number, because 142440321 - 2⁵ = 142440289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142440323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1626 + ... + 16956.

It is an arithmetic number, because the mean of its divisors is an integer number (12572240).

Almost surely, 2^142440321 is an apocalyptic number.

It is an amenable number.

142440321 is a deficient number, since it is larger than the sum of its proper divisors (58715519).

142440321 is a wasteful number, since it uses less digits than its factorization.

142440321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15516.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 142440321 is about 11934.8364463029. The cubic root of 142440321 is about 522.2490370836.

Adding to 142440321 its reverse (123044241), we get a palindrome (265484562).

The spelling of 142440321 in words is "one hundred forty-two million, four hundred forty thousand, three hundred twenty-one".