40396009 has 2 divisors, whose sum is σ = 40396010. Its totient is φ = 40396008.

The previous prime is 40395991. The next prime is 40396039. The reversal of 40396009 is 90069304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27457600 + 12938409 = 5240^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 40396009 - 2⁵ = 40395977 is a prime.

It is not a weakly prime, because it can be changed into another prime (40396039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20198004 + 20198005.

It is an arithmetic number, because the mean of its divisors is an integer number (20198005).

Almost surely, 2^40396009 is an apocalyptic number.

It is an amenable number.

40396009 is a deficient number, since it is larger than the sum of its proper divisors (1).

40396009 is an equidigital number, since it uses as much as digits as its factorization.

40396009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 40396009 is about 6355.7854746679. The cubic root of 40396009 is about 343.1200949639.

The spelling of 40396009 in words is "forty million, three hundred ninety-six thousand, nine".