400321442 has 4 divisors (see below), whose sum is σ = 600482166. Its totient is φ = 200160720.

The previous prime is 400321421. The next prime is 400321487. The reversal of 400321442 is 244123004.

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., 228947161 + 171374281 = 15131^2 + 13091^2 .

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, 100080359 + ... + 100080362.

Almost surely, 2^400321442 is an apocalyptic number.

400321442 is a deficient number, since it is larger than the sum of its proper divisors (200160724).

400321442 is a wasteful number, since it uses less digits than its factorization.

400321442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200160723.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 400321442 is about 20008.0344361959. The cubic root of 400321442 is about 737.0036139588.

Adding to 400321442 its reverse (244123004), we get a palindrome (644444446).

The spelling of 400321442 in words is "four hundred million, three hundred twenty-one thousand, four hundred forty-two".