40323521 has 12 divisors (see below), whose sum is σ = 47553732. Its totient is φ = 34086528.

The previous prime is 40323511. The next prime is 40323553. The reversal of 40323521 is 12532304.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16313521 + 24010000 = 4039^2 + 4900^2 .

It is not a de Polignac number, because 40323521 - 2⁶ = 40323457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40323493 and 40323502.

It is not an unprimeable number, because it can be changed into a prime (40323511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2060 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (3962811).

Almost surely, 2^40323521 is an apocalyptic number.

It is an amenable number.

40323521 is a deficient number, since it is larger than the sum of its proper divisors (7230211).

40323521 is a wasteful number, since it uses less digits than its factorization.

40323521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11360 (or 11353 counting only the distinct ones).

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

The square root of 40323521 is about 6350.0803931919. The cubic root of 40323521 is about 342.9147365467.

Adding to 40323521 its reverse (12532304), we get a palindrome (52855825).

The spelling of 40323521 in words is "forty million, three hundred twenty-three thousand, five hundred twenty-one".