4000321 has 16 divisors (see below), whose sum is σ = 4765824. Its totient is φ = 3320064.

The previous prime is 4000309. The next prime is 4000343. The reversal of 4000321 is 1230004.

It is a cyclic number.

It is not a de Polignac number, because 4000321 - 2¹¹ = 3998273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000298 and 4000307.

It is not an unprimeable number, because it can be changed into a prime (4000301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4690 + ... + 5476.

It is an arithmetic number, because the mean of its divisors is an integer number (297864).

Almost surely, 2^4000321 is an apocalyptic number.

It is an amenable number.

4000321 is a deficient number, since it is larger than the sum of its proper divisors (765503).

4000321 is a wasteful number, since it uses less digits than its factorization.

4000321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 4000321 is about 2000.0802483900. The cubic root of 4000321 is about 158.7443513811.

Adding to 4000321 its reverse (1230004), we get a palindrome (5230325).

The spelling of 4000321 in words is "four million, three hundred twenty-one", and thus it is an aban number.