40546409 has 2 divisors, whose sum is σ = 40546410. Its totient is φ = 40546408.

The previous prime is 40546403. The next prime is 40546423. The reversal of 40546409 is 90464504.

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., 21160000 + 19386409 = 4600^2 + 4403^2 .

It is a cyclic number.

It is not a de Polignac number, because 40546409 - 2⁸ = 40546153 is a prime.

It is a super-2 number, since 2×40546409² = 3288022565590562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40546403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20273204 + 20273205.

It is an arithmetic number, because the mean of its divisors is an integer number (20273205).

Almost surely, 2^40546409 is an apocalyptic number.

It is an amenable number.

40546409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40546409 is an equidigital number, since it uses as much as digits as its factorization.

40546409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 40546409 is about 6367.6062221215. The cubic root of 40546409 is about 343.5453956405.

The spelling of 40546409 in words is "forty million, five hundred forty-six thousand, four hundred nine".