404021242 has 4 divisors (see below), whose sum is σ = 606031866. Its totient is φ = 202010620.

The previous prime is 404021237. The next prime is 404021251. The reversal of 404021242 is 242120404.

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., 249292521 + 154728721 = 15789^2 + 12439^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101005309 + ... + 101005312.

Almost surely, 2^404021242 is an apocalyptic number.

404021242 is a deficient number, since it is larger than the sum of its proper divisors (202010624).

404021242 is a wasteful number, since it uses less digits than its factorization.

404021242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202010623.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 404021242 is about 20100.2796497959. The cubic root of 404021242 is about 739.2671354107.

Adding to 404021242 its reverse (242120404), we get a palindrome (646141646).

The spelling of 404021242 in words is "four hundred four million, twenty-one thousand, two hundred forty-two".