67387409 has 2 divisors, whose sum is σ = 67387410. Its totient is φ = 67387408.

The previous prime is 67387399. The next prime is 67387417. The reversal of 67387409 is 90478376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 6235009 = 7820^2 + 2497^2 .

It is a cyclic number.

It is not a de Polignac number, because 67387409 - 2⁸ = 67387153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67387409.

It is not a weakly prime, because it can be changed into another prime (67387469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33693704 + 33693705.

It is an arithmetic number, because the mean of its divisors is an integer number (33693705).

Almost surely, 2^67387409 is an apocalyptic number.

It is an amenable number.

67387409 is a deficient number, since it is larger than the sum of its proper divisors (1).

67387409 is an equidigital number, since it uses as much as digits as its factorization.

67387409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 67387409 is about 8208.9834328009. The cubic root of 67387409 is about 406.9361320617.

The spelling of 67387409 in words is "sixty-seven million, three hundred eighty-seven thousand, four hundred nine".