142240634 has 4 divisors (see below), whose sum is σ = 213360954. Its totient is φ = 71120316.

The previous prime is 142240633. The next prime is 142240639. The reversal of 142240634 is 436042241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 436042241 = 727 ⋅599783.

It can be written as a sum of positive squares in only one way, i.e., 117787609 + 24453025 = 10853^2 + 4945^2 .

It is not an unprimeable number, because it can be changed into a prime (142240633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35560157 + ... + 35560160.

Almost surely, 2^142240634 is an apocalyptic number.

142240634 is a deficient number, since it is larger than the sum of its proper divisors (71120320).

142240634 is an equidigital number, since it uses as much as digits as its factorization.

142240634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71120319.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 142240634 is about 11926.4677922678. The cubic root of 142240634 is about 522.0048760817.

Adding to 142240634 its reverse (436042241), we get a palindrome (578282875).

The spelling of 142240634 in words is "one hundred forty-two million, two hundred forty thousand, six hundred thirty-four".