40120321 has 4 divisors (see below), whose sum is σ = 41204692. Its totient is φ = 39035952.

The previous prime is 40120319. The next prime is 40120351. The reversal of 40120321 is 12302104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37761025 + 2359296 = 6145^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 40120321 - 2¹ = 40120319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40120351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542130 + ... + 542203.

It is an arithmetic number, because the mean of its divisors is an integer number (10301173).

Almost surely, 2^40120321 is an apocalyptic number.

It is an amenable number.

40120321 is a deficient number, since it is larger than the sum of its proper divisors (1084371).

40120321 is a wasteful number, since it uses less digits than its factorization.

40120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084370.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 40120321 is about 6334.0603880923. The cubic root of 40120321 is about 342.3377561079.

Adding to 40120321 its reverse (12302104), we get a palindrome (52422425).

The spelling of 40120321 in words is "forty million, one hundred twenty thousand, three hundred twenty-one".