289947391 has 16 divisors (see below), whose sum is σ = 311385600. Its totient is φ = 269172288.

The previous prime is 289947379. The next prime is 289947401. The reversal of 289947391 is 193749982.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 289947391 - 2⁹ = 289946879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289947311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303771 + ... + 304723.

It is an arithmetic number, because the mean of its divisors is an integer number (19461600).

Almost surely, 2^289947391 is an apocalyptic number.

289947391 is a deficient number, since it is larger than the sum of its proper divisors (21438209).

289947391 is a wasteful number, since it uses less digits than its factorization.

289947391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its digits is 979776, while the sum is 52.

The square root of 289947391 is about 17027.8416424396. The cubic root of 289947391 is about 661.8705665723.

The spelling of 289947391 in words is "two hundred eighty-nine million, nine hundred forty-seven thousand, three hundred ninety-one".