403040042 has 4 divisors (see below), whose sum is σ = 604560066. Its totient is φ = 201520020.

The previous prime is 403040039. The next prime is 403040047. The reversal of 403040042 is 240040304.

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., 357625921 + 45414121 = 18911^2 + 6739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 403040042.

It is not an unprimeable number, because it can be changed into a prime (403040047) 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, 100760009 + ... + 100760012.

Almost surely, 2^403040042 is an apocalyptic number.

403040042 is a deficient number, since it is larger than the sum of its proper divisors (201520024).

403040042 is a wasteful number, since it uses less digits than its factorization.

403040042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201520023.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 403040042 is about 20075.8571921599. The cubic root of 403040042 is about 738.6681925515.

Adding to 403040042 its reverse (240040304), we get a palindrome (643080346).

The spelling of 403040042 in words is "four hundred three million, forty thousand, forty-two".