142231220 has 12 divisors (see below), whose sum is σ = 298685604. Its totient is φ = 56892480.

The previous prime is 142231181. The next prime is 142231249. The reversal of 142231220 is 22132241.

It can be written as a sum of positive squares in 2 ways, for example, as 71301136 + 70930084 = 8444^2 + 8422^2 .

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, 3555761 + ... + 3555800.

It is an arithmetic number, because the mean of its divisors is an integer number (24890467).

Almost surely, 2^142231220 is an apocalyptic number.

142231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142231220 is an abundant number, since it is smaller than the sum of its proper divisors (156454384).

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

142231220 is a wasteful number, since it uses less digits than its factorization.

142231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111570 (or 7111568 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 142231220 is about 11926.0731173341. The cubic root of 142231220 is about 521.9933597703.

Adding to 142231220 its reverse (22132241), we get a palindrome (164363461).

The spelling of 142231220 in words is "one hundred forty-two million, two hundred thirty-one thousand, two hundred twenty".