289905988 has 24 divisors (see below), whose sum is σ = 513196992. Its totient is φ = 143288544.

The previous prime is 289905983. The next prime is 289905991. The reversal of 289905988 is 889509982.

It is a happy number.

It is a super-2 number, since 2×289905988² = 168090963756512288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (289905983) 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 7 ways as a sum of consecutive naturals, for example, 130495 + ... + 132697.

It is an arithmetic number, because the mean of its divisors is an integer number (21383208).

Almost surely, 2^289905988 is an apocalyptic number.

It is an amenable number.

289905988 is a deficient number, since it is larger than the sum of its proper divisors (223291004).

289905988 is a wasteful number, since it uses less digits than its factorization.

289905988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 58.

The square root of 289905988 is about 17026.6258548193. The cubic root of 289905988 is about 661.8390611654.

The spelling of 289905988 in words is "two hundred eighty-nine million, nine hundred five thousand, nine hundred eighty-eight".