439630042 has 4 divisors (see below), whose sum is σ = 659445066. Its totient is φ = 219815020.

The previous prime is 439629991. The next prime is 439630049. The reversal of 439630042 is 240036934.

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., 436350321 + 3279721 = 20889^2 + 1811^2 .

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 a junction number, because it is equal to n+sod(n) for n = 439629986 and 439630013.

It is not an unprimeable number, because it can be changed into a prime (439630049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109907509 + ... + 109907512.

Almost surely, 2^439630042 is an apocalyptic number.

439630042 is a deficient number, since it is larger than the sum of its proper divisors (219815024).

439630042 is a wasteful number, since it uses less digits than its factorization.

439630042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219815023.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 439630042 is about 20967.3565811239. The cubic root of 439630042 is about 760.3772607593.

Adding to 439630042 its reverse (240036934), we get a palindrome (679666976).

The spelling of 439630042 in words is "four hundred thirty-nine million, six hundred thirty thousand, forty-two".