40322509 has 2 divisors, whose sum is σ = 40322510. Its totient is φ = 40322508.

The previous prime is 40322501. The next prime is 40322539. The reversal of 40322509 is 90522304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40322500 + 9 = 6350^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 40322509 - 2³ = 40322501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40322501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20161254 + 20161255.

It is an arithmetic number, because the mean of its divisors is an integer number (20161255).

Almost surely, 2^40322509 is an apocalyptic number.

It is an amenable number.

40322509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40322509 is an equidigital number, since it uses as much as digits as its factorization.

40322509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 40322509 is about 6350.0007086614. Note that the first 3 decimals coincide. The cubic root of 40322509 is about 342.9118678106.

The spelling of 40322509 in words is "forty million, three hundred twenty-two thousand, five hundred nine".