67986389 has 4 divisors (see below), whose sum is σ = 71564640. Its totient is φ = 64408140.

The previous prime is 67986329. The next prime is 67986403. The reversal of 67986389 is 98368976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67986389 - 2⁸ = 67986133 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67986329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789097 + ... + 1789134.

It is an arithmetic number, because the mean of its divisors is an integer number (17891160).

Almost surely, 2^67986389 is an apocalyptic number.

It is an amenable number.

67986389 is a deficient number, since it is larger than the sum of its proper divisors (3578251).

67986389 is a wasteful number, since it uses less digits than its factorization.

67986389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578250.

The product of its digits is 3919104, while the sum is 56.

The square root of 67986389 is about 8245.3859218353. The cubic root of 67986389 is about 408.1382753316.

The spelling of 67986389 in words is "sixty-seven million, nine hundred eighty-six thousand, three hundred eighty-nine".