40003321 has 4 divisors (see below), whose sum is σ = 40015972. Its totient is φ = 39990672.

The previous prime is 40003319. The next prime is 40003387. The reversal of 40003321 is 12330004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36723600 + 3279721 = 6060^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 40003321 - 2¹ = 40003319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40003391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3091 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (10003993).

Almost surely, 2^40003321 is an apocalyptic number.

It is an amenable number.

40003321 is a deficient number, since it is larger than the sum of its proper divisors (12651).

40003321 is an equidigital number, since it uses as much as digits as its factorization.

40003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12650.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40003321 is about 6324.8178629902. The cubic root of 40003321 is about 342.0046537903.

Adding to 40003321 its reverse (12330004), we get a palindrome (52333325).

The spelling of 40003321 in words is "forty million, three thousand, three hundred twenty-one".