67940009 has 2 divisors, whose sum is σ = 67940010. Its totient is φ = 67940008.

The previous prime is 67939997. The next prime is 67940057. The reversal of 67940009 is 90004976.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46963609 + 20976400 = 6853^2 + 4580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67940009 is a prime.

It is not a weakly prime, because it can be changed into another prime (67940099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33970004 + 33970005.

It is an arithmetic number, because the mean of its divisors is an integer number (33970005).

Almost surely, 2^67940009 is an apocalyptic number.

It is an amenable number.

67940009 is a deficient number, since it is larger than the sum of its proper divisors (1).

67940009 is an equidigital number, since it uses as much as digits as its factorization.

67940009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 67940009 is about 8242.5729599440. The cubic root of 67940009 is about 408.0454442044.

The spelling of 67940009 in words is "sixty-seven million, nine hundred forty thousand, nine".