143220424 has 32 divisors (see below), whose sum is σ = 273166200. Its totient is φ = 70387200.

The previous prime is 143220397. The next prime is 143220431. The reversal of 143220424 is 424022341.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115992900 + 27227524 = 10770^2 + 5218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 143220395 and 143220404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126292 + ... + 127420.

Almost surely, 2^143220424 is an apocalyptic number.

It is an amenable number.

143220424 is a deficient number, since it is larger than the sum of its proper divisors (129945776).

143220424 is a wasteful number, since it uses less digits than its factorization.

143220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1389 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 143220424 is about 11967.4735846794. The cubic root of 143220424 is about 523.2007024122.

Adding to 143220424 its reverse (424022341), we get a palindrome (567242765).

The spelling of 143220424 in words is "one hundred forty-three million, two hundred twenty thousand, four hundred twenty-four".