40909513 has 4 divisors (see below), whose sum is σ = 41907348. Its totient is φ = 39911680.

The previous prime is 40909501. The next prime is 40909529. The reversal of 40909513 is 31590904.

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 16426809 + 24482704 = 4053^2 + 4948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40909513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40909543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498856 + ... + 498937.

It is an arithmetic number, because the mean of its divisors is an integer number (10476837).

Almost surely, 2^40909513 is an apocalyptic number.

It is an amenable number.

40909513 is a deficient number, since it is larger than the sum of its proper divisors (997835).

40909513 is an equidigital number, since it uses as much as digits as its factorization.

40909513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997834.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 40909513 is about 6396.0544869474. The cubic root of 40909513 is about 344.5678633414.

The spelling of 40909513 in words is "forty million, nine hundred nine thousand, five hundred thirteen".