40392009 has 12 divisors (see below), whose sum is σ = 66678976. Its totient is φ = 23081112.

The previous prime is 40391999. The next prime is 40392031. The reversal of 40392009 is 90029304.

It is not a de Polignac number, because 40392009 - 2⁴ = 40391993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40392509) 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 11 ways as a sum of consecutive naturals, for example, 320509 + ... + 320634.

Almost surely, 2^40392009 is an apocalyptic number.

It is an amenable number.

40392009 is a deficient number, since it is larger than the sum of its proper divisors (26286967).

40392009 is a wasteful number, since it uses less digits than its factorization.

40392009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641156 (or 641153 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 40392009 is about 6355.4707929468. The cubic root of 40392009 is about 343.1087693757.

The spelling of 40392009 in words is "forty million, three hundred ninety-two thousand, nine".