206840425 has 36 divisors (see below), whose sum is σ = 285130188. Its totient is φ = 148720000.

The previous prime is 206840423. The next prime is 206840429. The reversal of 206840425 is 524048602.

It can be written as a sum of positive squares in 6 ways, for example, as 48483369 + 158357056 = 6963^2 + 12584^2 .

It is not a de Polignac number, because 206840425 - 2¹ = 206840423 is a prime.

It is a super-2 number, since 2×206840425² = 85565922828361250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206840423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 305187 + ... + 305863.

It is an arithmetic number, because the mean of its divisors is an integer number (7920283).

Almost surely, 2^206840425 is an apocalyptic number.

206840425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206840425 is a deficient number, since it is larger than the sum of its proper divisors (78289763).

206840425 is a wasteful number, since it uses less digits than its factorization.

206840425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 206840425 is about 14381.9478861523. The cubic root of 206840425 is about 591.3961239699.

The spelling of 206840425 in words is "two hundred six million, eight hundred forty thousand, four hundred twenty-five".