206387669 has 4 divisors (see below), whose sum is σ = 210778944. Its totient is φ = 201996396.

The previous prime is 206387663. The next prime is 206387681. The reversal of 206387669 is 966783602.

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 206387669 - 2⁴ = 206387653 is a prime.

It is a super-2 number, since 2×206387669² = 85191739830507122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 4391227 = 206387669 / (2 + 0 + 6 + 3 + 8 + 7 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206387663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195567 + ... + 2195660.

It is an arithmetic number, because the mean of its divisors is an integer number (52694736).

Almost surely, 2^206387669 is an apocalyptic number.

It is an amenable number.

206387669 is a deficient number, since it is larger than the sum of its proper divisors (4391275).

206387669 is an equidigital number, since it uses as much as digits as its factorization.

206387669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391274.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 206387669 is about 14366.1988361570. The cubic root of 206387669 is about 590.9643035653.

The spelling of 206387669 in words is "two hundred six million, three hundred eighty-seven thousand, six hundred sixty-nine".