400426221 has 16 divisors (see below), whose sum is σ = 576825536. Its totient is φ = 245621376.

The previous prime is 400426217. The next prime is 400426241. The reversal of 400426221 is 122624004.

It is not a de Polignac number, because 400426221 - 2² = 400426217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400426241) 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 in 15 ways as a sum of consecutive naturals, for example, 4195 + ... + 28608.

It is an arithmetic number, because the mean of its divisors is an integer number (36051596).

Almost surely, 2^400426221 is an apocalyptic number.

It is an amenable number.

400426221 is a deficient number, since it is larger than the sum of its proper divisors (176399315).

400426221 is a wasteful number, since it uses less digits than its factorization.

400426221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33132.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 400426221 is about 20010.6526880060. The cubic root of 400426221 is about 737.0679087622.

The spelling of 400426221 in words is "four hundred million, four hundred twenty-six thousand, two hundred twenty-one".