400304321 has 8 divisors (see below), whose sum is σ = 431036640. Its totient is φ = 370370368.

The previous prime is 400304237. The next prime is 400304327. The reversal of 400304321 is 123403004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400304321 is a prime.

It is a super-2 number, since 2×400304321² = 320487098822542082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 400304321.

It is not an unprimeable number, because it can be changed into a prime (400304327) 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, 198551 + ... + 200556.

It is an arithmetic number, because the mean of its divisors is an integer number (53879580).

Almost surely, 2^400304321 is an apocalyptic number.

It is an amenable number.

400304321 is a deficient number, since it is larger than the sum of its proper divisors (30732319).

400304321 is a wasteful number, since it uses less digits than its factorization.

400304321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399183.

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

The square root of 400304321 is about 20007.6065784991. The cubic root of 400304321 is about 736.9931070532.

Adding to 400304321 its reverse (123403004), we get a palindrome (523707325).

The spelling of 400304321 in words is "four hundred million, three hundred four thousand, three hundred twenty-one".