396656009 has 2 divisors, whose sum is σ = 396656010. Its totient is φ = 396656008.

The previous prime is 396655991. The next prime is 396656069. The reversal of 396656009 is 900656693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347263225 + 49392784 = 18635^2 + 7028^2 .

It is a cyclic number.

It is not a de Polignac number, because 396656009 - 2¹⁶ = 396590473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (396656069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198328004 + 198328005.

It is an arithmetic number, because the mean of its divisors is an integer number (198328005).

Almost surely, 2^396656009 is an apocalyptic number.

It is an amenable number.

396656009 is a deficient number, since it is larger than the sum of its proper divisors (1).

396656009 is an equidigital number, since it uses as much as digits as its factorization.

396656009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 396656009 is about 19916.2247677616. The cubic root of 396656009 is about 734.7473233294.

The spelling of 396656009 in words is "three hundred ninety-six million, six hundred fifty-six thousand, nine".