206427409 has 4 divisors (see below), whose sum is σ = 206515440. Its totient is φ = 206339380.

The previous prime is 206427373. The next prime is 206427427. The reversal of 206427409 is 904724602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206427409 - 2⁷ = 206427281 is a prime.

It is a super-2 number, since 2×206427409² = 85224550372906562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206427439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40399 + ... + 45220.

It is an arithmetic number, because the mean of its divisors is an integer number (51628860).

Almost surely, 2^206427409 is an apocalyptic number.

It is an amenable number.

206427409 is a deficient number, since it is larger than the sum of its proper divisors (88031).

206427409 is an equidigital number, since it uses as much as digits as its factorization.

206427409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88030.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 206427409 is about 14367.5818772680. The cubic root of 206427409 is about 591.0022312419.

The spelling of 206427409 in words is "two hundred six million, four hundred twenty-seven thousand, four hundred nine".