40615909 has 4 divisors (see below), whose sum is σ = 40635916. Its totient is φ = 40595904.

The previous prime is 40615891. The next prime is 40615933. The reversal of 40615909 is 90951604.

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 26553409 + 14062500 = 5153^2 + 3750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40615909 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 (40615969) 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, 6564 + ... + 11149.

It is an arithmetic number, because the mean of its divisors is an integer number (10158979).

Almost surely, 2^40615909 is an apocalyptic number.

It is an amenable number.

40615909 is a deficient number, since it is larger than the sum of its proper divisors (20007).

40615909 is a wasteful number, since it uses less digits than its factorization.

40615909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20006.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 40615909 is about 6373.0611953754. The cubic root of 40615909 is about 343.7415722892.

The spelling of 40615909 in words is "forty million, six hundred fifteen thousand, nine hundred nine".