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6990 = 235233

6990 has 16 divisors (see below), whose sum is σ = 16848. Its totient is φ = 1856.

The previous prime is 6983. The next prime is 6991. The reversal of 6990 is 996.

It is a nialpdrome in base 6 and base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 6990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87 + ... + 146.

It is an arithmetic number, because the mean of its divisors is an integer number (1053).

26990 is an apocalyptic number.

6990 is an abundant number, since it is smaller than the sum of its proper divisors (9858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8424).

6990 is a wasteful number, since it uses less digits than its factorization.

6990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 6990 is about 83.6062198643. The cubic root of 6990 is about 19.1201982905.

The spelling of 6990 in words is "six thousand, nine hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 233 466 699 1165 1398 2330 3495 6990