143689394 has 4 divisors (see below), whose sum is σ = 215534094. Its totient is φ = 71844696.

The previous prime is 143689373. The next prime is 143689397. The reversal of 143689394 is 493986341.

It is a happy number.

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., 143688169 + 1225 = 11987^2 + 35^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (143689397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35922347 + ... + 35922350.

Almost surely, 2^143689394 is an apocalyptic number.

143689394 is a deficient number, since it is larger than the sum of its proper divisors (71844700).

143689394 is an equidigital number, since it uses as much as digits as its factorization.

143689394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71844699.

The product of its digits is 559872, while the sum is 47.

The square root of 143689394 is about 11987.0510969129. The cubic root of 143689394 is about 523.7711473700.

The spelling of 143689394 in words is "one hundred forty-three million, six hundred eighty-nine thousand, three hundred ninety-four".