142128247 has 4 divisors (see below), whose sum is σ = 148307760. Its totient is φ = 135948736.

The previous prime is 142128223. The next prime is 142128251. The reversal of 142128247 is 742821241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142128247 - 2¹¹ = 142126199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142128647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089722 + ... + 3089767.

It is an arithmetic number, because the mean of its divisors is an integer number (37076940).

Almost surely, 2^142128247 is an apocalyptic number.

142128247 is a deficient number, since it is larger than the sum of its proper divisors (6179513).

142128247 is an equidigital number, since it uses as much as digits as its factorization.

142128247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179512.

The product of its digits is 7168, while the sum is 31.

The square root of 142128247 is about 11921.7551979564. The cubic root of 142128247 is about 521.8673579002.

Adding to 142128247 its reverse (742821241), we get a palindrome (884949488).

The spelling of 142128247 in words is "one hundred forty-two million, one hundred twenty-eight thousand, two hundred forty-seven".