142247636 has 12 divisors (see below), whose sum is σ = 263576628. Its totient is φ = 66940032.

The previous prime is 142247557. The next prime is 142247657. The reversal of 142247636 is 636742241.

It can be written as a sum of positive squares in 2 ways, for example, as 132388036 + 9859600 = 11506^2 + 3140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 142247596 and 142247605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045871 + ... + 1046006.

It is an arithmetic number, because the mean of its divisors is an integer number (21964719).

Almost surely, 2^142247636 is an apocalyptic number.

It is an amenable number.

142247636 is a deficient number, since it is larger than the sum of its proper divisors (121328992).

142247636 is a wasteful number, since it uses less digits than its factorization.

142247636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091898 (or 2091896 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 142247636 is about 11926.7613374294. The cubic root of 142247636 is about 522.0134414217.

Adding to 142247636 its reverse (636742241), we get a palindrome (778989877).

The spelling of 142247636 in words is "one hundred forty-two million, two hundred forty-seven thousand, six hundred thirty-six".