143904394 has 4 divisors (see below), whose sum is σ = 215856594. Its totient is φ = 71952196.

The previous prime is 143904391. The next prime is 143904403. The reversal of 143904394 is 493409341.

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 + 216225 = 11987^2 + 465^2 .

It is a super-2 number, since 2×143904394² = 41416949225014472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (143904391) by changing a digit.

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, 35976097 + ... + 35976100.

Almost surely, 2^143904394 is an apocalyptic number.

143904394 is a deficient number, since it is larger than the sum of its proper divisors (71952200).

143904394 is an equidigital number, since it uses as much as digits as its factorization.

143904394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71952199.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 143904394 is about 11996.0157552414. The cubic root of 143904394 is about 524.0322538078.

The spelling of 143904394 in words is "one hundred forty-three million, nine hundred four thousand, three hundred ninety-four".