142821228 has 24 divisors (see below), whose sum is σ = 363545280. Its totient is φ = 43279120.

The previous prime is 142821227. The next prime is 142821229. The reversal of 142821228 is 822128241.

It is an interprime number because it is at equal distance from previous prime (142821227) and next prime (142821229).

It is a super-3 number, since 3×142821228³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 142821195 and 142821204.

It is not an unprimeable number, because it can be changed into a prime (142821227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540858 + ... + 541121.

It is an arithmetic number, because the mean of its divisors is an integer number (15147720).

Almost surely, 2^142821228 is an apocalyptic number.

It is an amenable number.

142821228 is an abundant number, since it is smaller than the sum of its proper divisors (220724052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142821228 is a wasteful number, since it uses less digits than its factorization.

142821228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081997 (or 1081995 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 142821228 is about 11950.7835726366. The cubic root of 142821228 is about 522.7141470891.

Adding to 142821228 its reverse (822128241), we get a palindrome (964949469).

The spelling of 142821228 in words is "one hundred forty-two million, eight hundred twenty-one thousand, two hundred twenty-eight".