143621138 has 4 divisors (see below), whose sum is σ = 215431710. Its totient is φ = 71810568.

The previous prime is 143621129. The next prime is 143621167. The reversal of 143621138 is 831126341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 92025649 + 51595489 = 9593^2 + 7183^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 143621138.

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 as a sum of consecutive naturals, namely, 35905283 + ... + 35905286.

Almost surely, 2^143621138 is an apocalyptic number.

143621138 is a deficient number, since it is larger than the sum of its proper divisors (71810572).

143621138 is an equidigital number, since it uses as much as digits as its factorization.

143621138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71810571.

The product of its digits is 3456, while the sum is 29.

The square root of 143621138 is about 11984.2036865200. The cubic root of 143621138 is about 523.6881995042.

Adding to 143621138 its reverse (831126341), we get a palindrome (974747479).

The spelling of 143621138 in words is "one hundred forty-three million, six hundred twenty-one thousand, one hundred thirty-eight".