36405009 has 12 divisors (see below), whose sum is σ = 52854516. Its totient is φ = 24145632.

The previous prime is 36405001. The next prime is 36405013. The reversal of 36405009 is 90050463.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31674384 + 4730625 = 5628^2 + 2175^2 .

It is not a de Polignac number, because 36405009 - 2³ = 36405001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36405001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8494 + ... + 12039.

It is an arithmetic number, because the mean of its divisors is an integer number (4404543).

Almost surely, 2^36405009 is an apocalyptic number.

It is an amenable number.

36405009 is a deficient number, since it is larger than the sum of its proper divisors (16449507).

36405009 is a wasteful number, since it uses less digits than its factorization.

36405009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20736 (or 20733 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 36405009 is about 6033.6563541521. The cubic root of 36405009 is about 331.4263603892.

It can be divided in two parts, 3640 and 5009, that added together give a square (8649 = 93²).

The spelling of 36405009 in words is "thirty-six million, four hundred five thousand, nine".