400242242 has 16 divisors (see below), whose sum is σ = 604695672. Its totient is φ = 198681600.

The previous prime is 400242217. The next prime is 400242257. The reversal of 400242242 is 242242004.

It can be written as a sum of positive squares in 4 ways, for example, as 151265401 + 248976841 = 12299^2 + 15779^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306992 + ... + 308292.

Almost surely, 2^400242242 is an apocalyptic number.

400242242 is a deficient number, since it is larger than the sum of its proper divisors (204453430).

400242242 is a wasteful number, since it uses less digits than its factorization.

400242242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293.

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 400242242 is about 20006.0551333840. The cubic root of 400242242 is about 736.9550075724.

Adding to 400242242 its reverse (242242004), we get a palindrome (642484246).

The spelling of 400242242 in words is "four hundred million, two hundred forty-two thousand, two hundred forty-two".