142447557 has 16 divisors (see below), whose sum is σ = 221494400. Its totient is φ = 81398016.

The previous prime is 142447549. The next prime is 142447559. The reversal of 142447557 is 755744241.

It is not a de Polignac number, because 142447557 - 2³ = 142447549 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 (142447559) 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, 68188 + ... + 70245.

It is an arithmetic number, because the mean of its divisors is an integer number (13843400).

Almost surely, 2^142447557 is an apocalyptic number.

It is an amenable number.

142447557 is a deficient number, since it is larger than the sum of its proper divisors (79046843).

142447557 is an equidigital number, since it uses as much as digits as its factorization.

142447557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138457 (or 138443 counting only the distinct ones).

The product of its digits is 156800, while the sum is 39.

The square root of 142447557 is about 11935.1395886265. The cubic root of 142447557 is about 522.2578803896.

The spelling of 142447557 in words is "one hundred forty-two million, four hundred forty-seven thousand, five hundred fifty-seven".