40173409 has 2 divisors, whose sum is σ = 40173410. Its totient is φ = 40173408.

The previous prime is 40173403. The next prime is 40173437. The reversal of 40173409 is 90437104.

It is an a-pointer prime, because the next prime (40173437) can be obtained adding 40173409 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 19607184 = 4535^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 40173409 - 2⁷ = 40173281 is a prime.

It is a super-2 number, since 2×40173409² = 3227805581362562, which contains 22 as substring.

It is equal to p_2443591 and since 40173409 and 2443591 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40173403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086704 + 20086705.

It is an arithmetic number, because the mean of its divisors is an integer number (20086705).

Almost surely, 2^40173409 is an apocalyptic number.

It is an amenable number.

40173409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40173409 is an equidigital number, since it uses as much as digits as its factorization.

40173409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40173409 is about 6338.2496795251. The cubic root of 40173409 is about 342.4886855800.

The spelling of 40173409 in words is "forty million, one hundred seventy-three thousand, four hundred nine".