40395609 has 6 divisors (see below), whose sum is σ = 58349226. Its totient is φ = 26930400.

The previous prime is 40395599. The next prime is 40395643. The reversal of 40395609 is 90659304.

40395609 is a `hidden beast` number, since 40 + 3 + 9 + 5 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29975625 + 10419984 = 5475^2 + 3228^2 .

It is not a de Polignac number, because 40395609 - 2⁹ = 40395097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40395709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2244192 + ... + 2244209.

It is an arithmetic number, because the mean of its divisors is an integer number (9724871).

Almost surely, 2^40395609 is an apocalyptic number.

It is an amenable number.

40395609 is a deficient number, since it is larger than the sum of its proper divisors (17953617).

40395609 is a wasteful number, since it uses less digits than its factorization.

40395609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488407 (or 4488404 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 40395609 is about 6355.7540071969. The cubic root of 40395609 is about 343.1189624387.

The spelling of 40395609 in words is "forty million, three hundred ninety-five thousand, six hundred nine".