206990855 has 8 divisors (see below), whose sum is σ = 249651072. Its totient is φ = 164751328.

The previous prime is 206990779. The next prime is 206990881. The reversal of 206990855 is 558099602.

206990855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206990855 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104087 + ... + 106056.

It is an arithmetic number, because the mean of its divisors is an integer number (31206384).

Almost surely, 2^206990855 is an apocalyptic number.

206990855 is a deficient number, since it is larger than the sum of its proper divisors (42660217).

206990855 is a wasteful number, since it uses less digits than its factorization.

206990855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210345.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 206990855 is about 14387.1767557085. The cubic root of 206990855 is about 591.5394585567.

The spelling of 206990855 in words is "two hundred six million, nine hundred ninety thousand, eight hundred fifty-five".