40736509 has 4 divisors (see below), whose sum is σ = 44439840. Its totient is φ = 37033180.

The previous prime is 40736497. The next prime is 40736537. The reversal of 40736509 is 90563704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40736509 - 2¹⁷ = 40605437 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 (40736599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851649 + ... + 1851670.

It is an arithmetic number, because the mean of its divisors is an integer number (11109960).

Almost surely, 2^40736509 is an apocalyptic number.

It is an amenable number.

40736509 is a deficient number, since it is larger than the sum of its proper divisors (3703331).

40736509 is a wasteful number, since it uses less digits than its factorization.

40736509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3703330.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 40736509 is about 6382.5158832548. The cubic root of 40736509 is about 344.0814577468.

The spelling of 40736509 in words is "forty million, seven hundred thirty-six thousand, five hundred nine".