206400025 has 24 divisors (see below), whose sum is σ = 276640280. Its totient is φ = 151856640.

The previous prime is 206400017. The next prime is 206400071. The reversal of 206400025 is 520004602.

It can be written as a sum of positive squares in 12 ways, for example, as 92679129 + 113720896 = 9627^2 + 10664^2 .

It is not a de Polignac number, because 206400025 - 2³ = 206400017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206399975 and 206400011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100711 + ... + 102739.

Almost surely, 2^206400025 is an apocalyptic number.

206400025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206400025 is a deficient number, since it is larger than the sum of its proper divisors (70240255).

206400025 is a wasteful number, since it uses less digits than its factorization.

206400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365 (or 2360 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 206400025 is about 14366.6288669263. The cubic root of 206400025 is about 590.9760965975.

Adding to 206400025 its reverse (520004602), we get a palindrome (726404627).

The spelling of 206400025 in words is "two hundred six million, four hundred thousand, twenty-five".