206990 has 16 divisors (see below), whose sum is σ = 425952. Its totient is φ = 70944.

The previous prime is 206953. The next prime is 206993. The reversal of 206990 is 99602.

It is an Ulam number.

It is a Curzon number.

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 206990.

It is not an unprimeable number, because it can be changed into a prime (206993) by changing a digit.

206990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1409 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (26622).

2²⁰⁶⁹⁹⁰ is an apocalyptic number.

206990 is an abundant number, since it is smaller than the sum of its proper divisors (218962).

It is a weird number, because it is abundant, but not a pseudoperfect number.

206990 is a wasteful number, since it uses less digits than its factorization.

206990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 206990 is about 454.9615368358. The cubic root of 206990 is about 59.1538644081.

The spelling of 206990 in words is "two hundred six thousand, nine hundred ninety".