40032321 has 16 divisors (see below), whose sum is σ = 61564800. Its totient is φ = 22664448.

The previous prime is 40032319. The next prime is 40032323. The reversal of 40032321 is 12323004.

It is an interprime number because it is at equal distance from previous prime (40032319) and next prime (40032323).

It is not a de Polignac number, because 40032321 - 2¹ = 40032319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40032321.

It is not an unprimeable number, because it can be changed into a prime (40032323) 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, 6456 + ... + 11033.

It is an arithmetic number, because the mean of its divisors is an integer number (3847800).

Almost surely, 2^40032321 is an apocalyptic number.

It is an amenable number.

40032321 is a deficient number, since it is larger than the sum of its proper divisors (21532479).

40032321 is a wasteful number, since it uses less digits than its factorization.

40032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17608.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 40032321 is about 6327.1100037853. The cubic root of 40032321 is about 342.0872780907.

Adding to 40032321 its reverse (12323004), we get a palindrome (52355325).

The spelling of 40032321 in words is "forty million, thirty-two thousand, three hundred twenty-one".