40731009 has 16 divisors (see below), whose sum is σ = 59413440. Its totient is φ = 24615360.

The previous prime is 40731001. The next prime is 40731017. The reversal of 40731009 is 90013704.

It is an interprime number because it is at equal distance from previous prime (40731001) and next prime (40731017).

It is not a de Polignac number, because 40731009 - 2³ = 40731001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40731009.

It is not an unprimeable number, because it can be changed into a prime (40731001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11547 + ... + 14655.

It is an arithmetic number, because the mean of its divisors is an integer number (3713340).

Almost surely, 2^40731009 is an apocalyptic number.

It is an amenable number.

40731009 is a deficient number, since it is larger than the sum of its proper divisors (18682431).

40731009 is a wasteful number, since it uses less digits than its factorization.

40731009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 40731009 is about 6382.0850041346. The cubic root of 40731009 is about 344.0659717757.

The spelling of 40731009 in words is "forty million, seven hundred thirty-one thousand, nine".