487390989 has 4 divisors (see below), whose sum is σ = 649854656. Its totient is φ = 324927324.

The previous prime is 487390979. The next prime is 487391011. The reversal of 487390989 is 989093784.

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 de Polignac number, because none of the positive numbers 2^k-487390989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487390909) 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 3 ways as a sum of consecutive naturals, for example, 81231829 + ... + 81231834.

It is an arithmetic number, because the mean of its divisors is an integer number (162463664).

Almost surely, 2^487390989 is an apocalyptic number.

It is an amenable number.

487390989 is a deficient number, since it is larger than the sum of its proper divisors (162463667).

487390989 is a wasteful number, since it uses less digits than its factorization.

487390989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162463666.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The square root of 487390989 is about 22076.9334147657. The cubic root of 487390989 is about 786.9717907102.

The spelling of 487390989 in words is "four hundred eighty-seven million, three hundred ninety thousand, nine hundred eighty-nine".