143646394 has 4 divisors (see below), whose sum is σ = 215469594. Its totient is φ = 71823196.

The previous prime is 143646389. The next prime is 143646397. The reversal of 143646394 is 493646341.

143646394 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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., 139594225 + 4052169 = 11815^2 + 2013^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (143646397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35911597 + ... + 35911600.

Almost surely, 2^143646394 is an apocalyptic number.

143646394 is a deficient number, since it is larger than the sum of its proper divisors (71823200).

143646394 is an equidigital number, since it uses as much as digits as its factorization.

143646394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71823199.

The product of its digits is 186624, while the sum is 40.

The square root of 143646394 is about 11985.2573606077. The cubic root of 143646394 is about 523.7188948325.

The spelling of 143646394 in words is "one hundred forty-three million, six hundred forty-six thousand, three hundred ninety-four".