142721636 has 12 divisors (see below), whose sum is σ = 249855228. Its totient is φ = 71334432.

The previous prime is 142721627. The next prime is 142721651. The reversal of 142721636 is 636127241.

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 141467236 = 1120^2 + 11894^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10490 + ... + 19886.

It is an arithmetic number, because the mean of its divisors is an integer number (20821269).

Almost surely, 2^142721636 is an apocalyptic number.

It is an amenable number.

142721636 is a deficient number, since it is larger than the sum of its proper divisors (107133592).

142721636 is a wasteful number, since it uses less digits than its factorization.

142721636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13198 (or 13196 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 142721636 is about 11946.6160899227. The cubic root of 142721636 is about 522.5926192809.

Adding to 142721636 its reverse (636127241), we get a palindrome (778848877).

The spelling of 142721636 in words is "one hundred forty-two million, seven hundred twenty-one thousand, six hundred thirty-six".