206406425 has 6 divisors (see below), whose sum is σ = 255943998. Its totient is φ = 165125120.

The previous prime is 206406391. The next prime is 206406437. The reversal of 206406425 is 524604602.

It can be written as a sum of positive squares in 3 ways, for example, as 1658944 + 204747481 = 1288^2 + 14309^2 .

It is not a de Polignac number, because 206406425 - 2¹⁰ = 206405401 is a prime.

It is a super-2 number, since 2×206406425² = 85207224562561250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4128104 + ... + 4128153.

It is an arithmetic number, because the mean of its divisors is an integer number (42657333).

Almost surely, 2^206406425 is an apocalyptic number.

206406425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206406425 is a deficient number, since it is larger than the sum of its proper divisors (49537573).

206406425 is an equidigital number, since it uses as much as digits as its factorization.

206406425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256267 (or 8256262 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 206406425 is about 14366.8516036047. The cubic root of 206406425 is about 590.9822048137.

The spelling of 206406425 in words is "two hundred six million, four hundred six thousand, four hundred twenty-five".