404120042 has 16 divisors (see below), whose sum is σ = 616020552. Its totient is φ = 198804480.

The previous prime is 404120029. The next prime is 404120047. The reversal of 404120042 is 240021404.

It can be written as a sum of positive squares in 4 ways, for example, as 399240361 + 4879681 = 19981^2 + 2209^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 404120042.

It is not an unprimeable number, because it can be changed into a prime (404120047) 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 in 7 ways as a sum of consecutive naturals, for example, 27542 + ... + 39582.

Almost surely, 2^404120042 is an apocalyptic number.

404120042 is a deficient number, since it is larger than the sum of its proper divisors (211900510).

404120042 is a wasteful number, since it uses less digits than its factorization.

404120042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 404120042 is about 20102.7371768125. The cubic root of 404120042 is about 739.3273910214.

Adding to 404120042 its reverse (240021404), we get a palindrome (644141446).

The spelling of 404120042 in words is "four hundred four million, one hundred twenty thousand, forty-two".