142440401 has 4 divisors (see below), whose sum is σ = 143850804. Its totient is φ = 141030000.

The previous prime is 142440349. The next prime is 142440421. The reversal of 142440401 is 104044241.

It is a happy number.

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 111091600 + 31348801 = 10540^2 + 5599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142440401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142440421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705050 + ... + 705251.

It is an arithmetic number, because the mean of its divisors is an integer number (35962701).

Almost surely, 2^142440401 is an apocalyptic number.

It is an amenable number.

142440401 is a deficient number, since it is larger than the sum of its proper divisors (1410403).

142440401 is a wasteful number, since it uses less digits than its factorization.

142440401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410402.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 142440401 is about 11934.8397978356. The cubic root of 142440401 is about 522.2491348553.

Adding to 142440401 its reverse (104044241), we get a palindrome (246484642).

The spelling of 142440401 in words is "one hundred forty-two million, four hundred forty thousand, four hundred one".