400403321 has 8 divisors (see below), whose sum is σ = 427252320. Its totient is φ = 374131872.

The previous prime is 400403317. The next prime is 400403351. The reversal of 400403321 is 123304004.

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 400403321 - 2² = 400403317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400403321.

It is not an unprimeable number, because it can be changed into a prime (400403351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142955 + ... + 145728.

It is an arithmetic number, because the mean of its divisors is an integer number (53406540).

Almost surely, 2^400403321 is an apocalyptic number.

It is an amenable number.

400403321 is a deficient number, since it is larger than the sum of its proper divisors (26848999).

400403321 is a wasteful number, since it uses less digits than its factorization.

400403321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288775.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 400403321 is about 20010.0804845958. The cubic root of 400403321 is about 737.0538577536.

Adding to 400403321 its reverse (123304004), we get a palindrome (523707325).

The spelling of 400403321 in words is "four hundred million, four hundred three thousand, three hundred twenty-one".