40530409 has 2 divisors, whose sum is σ = 40530410. Its totient is φ = 40530408.

The previous prime is 40530407. The next prime is 40530419. The reversal of 40530409 is 90403504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36036009 + 4494400 = 6003^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 40530409 - 2¹ = 40530407 is a prime.

Together with 40530407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40530407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20265204 + 20265205.

It is an arithmetic number, because the mean of its divisors is an integer number (20265205).

Almost surely, 2^40530409 is an apocalyptic number.

It is an amenable number.

40530409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40530409 is an equidigital number, since it uses as much as digits as its factorization.

40530409 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 40530409 is about 6366.3497390577. The cubic root of 40530409 is about 343.5002009312.

The spelling of 40530409 in words is "forty million, five hundred thirty thousand, four hundred nine".