142440505 has 8 divisors (see below), whose sum is σ = 176442624. Its totient is φ = 110276400.

The previous prime is 142440497. The next prime is 142440509. The reversal of 142440505 is 505044241.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 142440505 - 2³ = 142440497 is a prime.

It is a super-3 number, since 3×142440505³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142440505.

It is not an unprimeable number, because it can be changed into a prime (142440509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459331 + ... + 459640.

It is an arithmetic number, because the mean of its divisors is an integer number (22055328).

Almost surely, 2^142440505 is an apocalyptic number.

It is an amenable number.

142440505 is a deficient number, since it is larger than the sum of its proper divisors (34002119).

142440505 is an equidigital number, since it uses as much as digits as its factorization.

142440505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919007.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 142440505 is about 11934.8441548267. The cubic root of 142440505 is about 522.2492619586.

Adding to 142440505 its reverse (505044241), we get a palindrome (647484746).

The spelling of 142440505 in words is "one hundred forty-two million, four hundred forty thousand, five hundred five".