40169609 has 2 divisors, whose sum is σ = 40169610. Its totient is φ = 40169608.

The previous prime is 40169603. The next prime is 40169653. The reversal of 40169609 is 90696104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40043584 + 126025 = 6328^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 40169609 - 2²⁴ = 23392393 is a prime.

It is a super-2 number, since 2×40169609² = 3227194974425762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40169603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20084804 + 20084805.

It is an arithmetic number, because the mean of its divisors is an integer number (20084805).

Almost surely, 2^40169609 is an apocalyptic number.

It is an amenable number.

40169609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40169609 is an equidigital number, since it uses as much as digits as its factorization.

40169609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 40169609 is about 6337.9499051349. The cubic root of 40169609 is about 342.4778865791.

The spelling of 40169609 in words is "forty million, one hundred sixty-nine thousand, six hundred nine".