143821642 has 4 divisors (see below), whose sum is σ = 215732466. Its totient is φ = 71910820.

The previous prime is 143821637. The next prime is 143821651. The reversal of 143821642 is 246128341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246128341 = 251 ⋅980591.

It can be written as a sum of positive squares in only one way, i.e., 100380361 + 43441281 = 10019^2 + 6591^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35955409 + ... + 35955412.

Almost surely, 2^143821642 is an apocalyptic number.

143821642 is a deficient number, since it is larger than the sum of its proper divisors (71910824).

143821642 is an equidigital number, since it uses as much as digits as its factorization.

143821642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71910823.

The product of its digits is 9216, while the sum is 31.

The square root of 143821642 is about 11992.5661140558. The cubic root of 143821642 is about 523.9317865675.

Adding to 143821642 its reverse (246128341), we get a palindrome (389949983).

The spelling of 143821642 in words is "one hundred forty-three million, eight hundred twenty-one thousand, six hundred forty-two".