206400215 has 16 divisors (see below), whose sum is σ = 289648128. Its totient is φ = 138239136.

The previous prime is 206400209. The next prime is 206400241. The reversal of 206400215 is 512004602.

It is a happy number.

It is not a de Polignac number, because 206400215 - 2⁸ = 206399959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67067 + ... + 70076.

It is an arithmetic number, because the mean of its divisors is an integer number (18103008).

Almost surely, 2^206400215 is an apocalyptic number.

206400215 is a deficient number, since it is larger than the sum of its proper divisors (83247913).

206400215 is a wasteful number, since it uses less digits than its factorization.

206400215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137198.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 206400215 is about 14366.6354794712. The cubic root of 206400215 is about 590.9762779369.

Adding to 206400215 its reverse (512004602), we get a palindrome (718404817).

The spelling of 206400215 in words is "two hundred six million, four hundred thousand, two hundred fifteen".