40509613 has 4 divisors (see below), whose sum is σ = 40683708. Its totient is φ = 40335520.

The previous prime is 40509593. The next prime is 40509641. The reversal of 40509613 is 31690504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20412324 + 20097289 = 4518^2 + 4483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40509613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40509683) 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 in 3 ways as a sum of consecutive naturals, for example, 86698 + ... + 87163.

It is an arithmetic number, because the mean of its divisors is an integer number (10170927).

Almost surely, 2^40509613 is an apocalyptic number.

It is an amenable number.

40509613 is a deficient number, since it is larger than the sum of its proper divisors (174095).

40509613 is a wasteful number, since it uses less digits than its factorization.

40509613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174094.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 40509613 is about 6364.7162544767. The cubic root of 40509613 is about 343.4414413277.

The spelling of 40509613 in words is "forty million, five hundred nine thousand, six hundred thirteen".