400316221 has 16 divisors (see below), whose sum is σ = 436097088. Its totient is φ = 366048000.

The previous prime is 400316179. The next prime is 400316243. The reversal of 400316221 is 122613004.

It is a cyclic number.

It is not a de Polignac number, because 400316221 - 2⁷ = 400316093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400316281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83746 + ... + 88396.

It is an arithmetic number, because the mean of its divisors is an integer number (27256068).

Almost surely, 2^400316221 is an apocalyptic number.

It is an amenable number.

400316221 is a deficient number, since it is larger than the sum of its proper divisors (35780867).

400316221 is a wasteful number, since it uses less digits than its factorization.

400316221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4812.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 400316221 is about 20007.9039631841. The cubic root of 400316221 is about 737.0004099397. Note that the first 3 decimals are identical.

Adding to 400316221 its reverse (122613004), we get a palindrome (522929225).

The spelling of 400316221 in words is "four hundred million, three hundred sixteen thousand, two hundred twenty-one".