400402321 has 8 divisors (see below), whose sum is σ = 439697088. Its totient is φ = 361590000.

The previous prime is 400402319. The next prime is 400402337. The reversal of 400402321 is 123204004.

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 400402321 - 2¹ = 400402319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400402295 and 400402304.

It is not an unprimeable number, because it can be changed into a prime (400402381) 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, 118870 + ... + 122191.

It is an arithmetic number, because the mean of its divisors is an integer number (54962136).

Almost surely, 2^400402321 is an apocalyptic number.

It is an amenable number.

400402321 is a deficient number, since it is larger than the sum of its proper divisors (39294767).

400402321 is a wasteful number, since it uses less digits than its factorization.

400402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241223.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 400402321 is about 20010.0554971744. The cubic root of 400402321 is about 737.0532441602.

Adding to 400402321 its reverse (123204004), we get a palindrome (523606325).

The spelling of 400402321 in words is "four hundred million, four hundred two thousand, three hundred twenty-one".