400303421 has 8 divisors (see below), whose sum is σ = 457999104. Its totient is φ = 342735120.

The previous prime is 400303391. The next prime is 400303427. The reversal of 400303421 is 124303004.

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

It is a de Polignac number, because none of the positive numbers 2^k-400303421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400303421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400303427) 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 7 ways as a sum of consecutive naturals, for example, 25010 + ... + 37763.

It is an arithmetic number, because the mean of its divisors is an integer number (57249888).

Almost surely, 2^400303421 is an apocalyptic number.

It is an amenable number.

400303421 is a deficient number, since it is larger than the sum of its proper divisors (57695683).

400303421 is an equidigital number, since it uses as much as digits as its factorization.

400303421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63691.

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

The square root of 400303421 is about 20007.5840870406. The cubic root of 400303421 is about 736.9925547282.

Adding to 400303421 its reverse (124303004), we get a palindrome (524606425).

The spelling of 400303421 in words is "four hundred million, three hundred three thousand, four hundred twenty-one".