206400671 has 4 divisors (see below), whose sum is σ = 208444344. Its totient is φ = 204357000.

The previous prime is 206400661. The next prime is 206400721. The reversal of 206400671 is 176004602.

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

It is a cyclic number.

It is not a de Polignac number, because 206400671 - 2²⁶ = 139291807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206400671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206400661) 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, 1021685 + ... + 1021886.

It is an arithmetic number, because the mean of its divisors is an integer number (52111086).

Almost surely, 2^206400671 is an apocalyptic number.

206400671 is a deficient number, since it is larger than the sum of its proper divisors (2043673).

206400671 is a wasteful number, since it uses less digits than its factorization.

206400671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043672.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 206400671 is about 14366.6513495665. The cubic root of 206400671 is about 590.9767131513.

The spelling of 206400671 in words is "two hundred six million, four hundred thousand, six hundred seventy-one".