400523221 has 8 divisors (see below), whose sum is σ = 458066240. Its totient is φ = 343061568.

The previous prime is 400523209. The next prime is 400523231. The reversal of 400523221 is 122325004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400523221 - 2⁹ = 400522709 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 (400523231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9396 + ... + 29821.

It is an arithmetic number, because the mean of its divisors is an integer number (57258280).

Almost surely, 2^400523221 is an apocalyptic number.

It is an amenable number.

400523221 is a deficient number, since it is larger than the sum of its proper divisors (57543019).

400523221 is a wasteful number, since it uses less digits than its factorization.

400523221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40683.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400523221 is about 20013.0762502920. The cubic root of 400523221 is about 737.1274201954.

Adding to 400523221 its reverse (122325004), we get a palindrome (522848225).

The spelling of 400523221 in words is "four hundred million, five hundred twenty-three thousand, two hundred twenty-one".