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6989 = 29241
BaseRepresentation
bin1101101001101
3100120212
41231031
5210424
652205
726243
oct15515
910525
106989
115284
124065
133248
142793
15210e
hex1b4d

6989 has 4 divisors (see below), whose sum is σ = 7260. Its totient is φ = 6720.

The previous prime is 6983. The next prime is 6991. The reversal of 6989 is 9896.

It is a happy number.

6989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4489 + 2500 = 67^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989 - 28 = 6733 is a prime.

It is a super-2 number, since 2×69892 = 97692242, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6983) 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, 92 + ... + 149.

It is an arithmetic number, because the mean of its divisors is an integer number (1815).

26989 is an apocalyptic number.

It is an amenable number.

6989 is a deficient number, since it is larger than the sum of its proper divisors (271).

6989 is a wasteful number, since it uses less digits than its factorization.

6989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270.

The product of its digits is 3888, while the sum is 32.

The square root of 6989 is about 83.6002392341. The cubic root of 6989 is about 19.1192864588.

Adding to 6989 its sum of digits (32), we get a triangular number (7021 = T118).

It can be divided in two parts, 698 and 9, that added together give a palindrome (707).

The spelling of 6989 in words is "six thousand, nine hundred eighty-nine".

Divisors: 1 29 241 6989