400221442 has 4 divisors (see below), whose sum is σ = 600332166. Its totient is φ = 200110720.

The previous prime is 400221407. The next prime is 400221473. The reversal of 400221442 is 244122004.

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., 377952481 + 22268961 = 19441^2 + 4719^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100055359 + ... + 100055362.

Almost surely, 2^400221442 is an apocalyptic number.

400221442 is a deficient number, since it is larger than the sum of its proper divisors (200110724).

400221442 is a wasteful number, since it uses less digits than its factorization.

400221442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200110723.

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

The square root of 400221442 is about 20005.5352840158. The cubic root of 400221442 is about 736.9422411957.

Adding to 400221442 its reverse (244122004), we get a palindrome (644343446).

The spelling of 400221442 in words is "four hundred million, two hundred twenty-one thousand, four hundred forty-two".