40335221 has 4 divisors (see below), whose sum is σ = 40351500. Its totient is φ = 40318944.

The previous prime is 40335209. The next prime is 40335223. The reversal of 40335221 is 12253304.

It is a happy number.

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 26122321 + 14212900 = 5111^2 + 3770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40335221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40335193 and 40335202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40335223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566 + ... + 9663.

It is an arithmetic number, because the mean of its divisors is an integer number (10087875).

Almost surely, 2^40335221 is an apocalyptic number.

It is an amenable number.

40335221 is a deficient number, since it is larger than the sum of its proper divisors (16279).

40335221 is a wasteful number, since it uses less digits than its factorization.

40335221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16278.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 40335221 is about 6351.0015745550. The cubic root of 40335221 is about 342.9478992793.

Subtracting from 40335221 its sum of digits (20), we obtain a square (40335201 = 6351²).

Adding to 40335221 its reverse (12253304), we get a palindrome (52588525).

The spelling of 40335221 in words is "forty million, three hundred thirty-five thousand, two hundred twenty-one".