40535221 has 4 divisors (see below), whose sum is σ = 41090572. Its totient is φ = 39979872.

The previous prime is 40535213. The next prime is 40535237. The reversal of 40535221 is 12253504.

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 21298225 + 19236996 = 4615^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 40535221 - 2³ = 40535213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40535192 and 40535201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40535251) 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, 277566 + ... + 277711.

It is an arithmetic number, because the mean of its divisors is an integer number (10272643).

Almost surely, 2^40535221 is an apocalyptic number.

It is an amenable number.

40535221 is a deficient number, since it is larger than the sum of its proper divisors (555351).

40535221 is an equidigital number, since it uses as much as digits as its factorization.

40535221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555350.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 40535221 is about 6366.7276524130. The cubic root of 40535221 is about 343.5137944905.

Adding to 40535221 its reverse (12253504), we get a palindrome (52788725).

The spelling of 40535221 in words is "forty million, five hundred thirty-five thousand, two hundred twenty-one".