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4989 = 31663
BaseRepresentation
bin1001101111101
320211210
41031331
5124424
635033
720355
oct11575
96753
104989
113826
122a79
13236a
141b65
151729
hex137d

4989 has 4 divisors (see below), whose sum is σ = 6656. Its totient is φ = 3324.

The previous prime is 4987. The next prime is 4993. The reversal of 4989 is 9894.

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 not a de Polignac number, because 4989 - 21 = 4987 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

4989 is a lucky number.

It is a plaindrome in base 13 and base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 4989.

It is not an unprimeable number, because it can be changed into a prime (4987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829 + ... + 834.

It is an arithmetic number, because the mean of its divisors is an integer number (1664).

It is an amenable number.

4989 is a deficient number, since it is larger than the sum of its proper divisors (1667).

4989 is a wasteful number, since it uses less digits than its factorization.

4989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666.

The product of its digits is 2592, while the sum is 30.

The square root of 4989 is about 70.6328535456. The cubic root of 4989 is about 17.0872104360.

The spelling of 4989 in words is "four thousand, nine hundred eighty-nine".

Divisors: 1 3 1663 4989