400242442 has 4 divisors (see below), whose sum is σ = 600363666. Its totient is φ = 200121220.

The previous prime is 400242439. The next prime is 400242443. The reversal of 400242442 is 244242004.

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., 311487201 + 88755241 = 17649^2 + 9421^2 .

It is not an unprimeable number, because it can be changed into a prime (400242443) by changing a digit.

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, 100060609 + ... + 100060612.

Almost surely, 2^400242442 is an apocalyptic number.

400242442 is a deficient number, since it is larger than the sum of its proper divisors (200121224).

400242442 is a wasteful number, since it uses less digits than its factorization.

400242442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200121223.

The product of its (nonzero) digits is 2048, while the sum is 22.

The square root of 400242442 is about 20006.0601318700. The cubic root of 400242442 is about 736.9551303239.

Adding to 400242442 its reverse (244242004), we get a palindrome (644484446).

The spelling of 400242442 in words is "four hundred million, two hundred forty-two thousand, four hundred forty-two".