40343521 has 2 divisors, whose sum is σ = 40343522. Its totient is φ = 40343520.

The previous prime is 40343519. The next prime is 40343543. The reversal of 40343521 is 12534304.

It is an a-pointer prime, because the next prime (40343543) can be obtained adding 40343521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35569296 + 4774225 = 5964^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 40343521 - 2¹ = 40343519 is a prime.

Together with 40343519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40343492 and 40343501.

It is not a weakly prime, because it can be changed into another prime (40343621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20171760 + 20171761.

It is an arithmetic number, because the mean of its divisors is an integer number (20171761).

Almost surely, 2^40343521 is an apocalyptic number.

It is an amenable number.

40343521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40343521 is an equidigital number, since it uses as much as digits as its factorization.

40343521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 40343521 is about 6351.6549811840. The cubic root of 40343521 is about 342.9714210904.

Adding to 40343521 its reverse (12534304), we get a palindrome (52877825).

The spelling of 40343521 in words is "forty million, three hundred forty-three thousand, five hundred twenty-one".