67406389 has 2 divisors, whose sum is σ = 67406390. Its totient is φ = 67406388.

The previous prime is 67406371. The next prime is 67406441. The reversal of 67406389 is 98360476.

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., 66994225 + 412164 = 8185^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 67406389 - 2¹⁷ = 67275317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67406189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33703194 + 33703195.

It is an arithmetic number, because the mean of its divisors is an integer number (33703195).

Almost surely, 2^67406389 is an apocalyptic number.

It is an amenable number.

67406389 is a deficient number, since it is larger than the sum of its proper divisors (1).

67406389 is an equidigital number, since it uses as much as digits as its factorization.

67406389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 67406389 is about 8210.1394019834. The cubic root of 67406389 is about 406.9743336727.

The spelling of 67406389 in words is "sixty-seven million, four hundred six thousand, three hundred eighty-nine".