206381929 has 4 divisors (see below), whose sum is σ = 222257476. Its totient is φ = 190506384.

The previous prime is 206381927. The next prime is 206381939. The reversal of 206381929 is 929183602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 929183602 = 2 ⋅464591801.

It can be written as a sum of positive squares in 2 ways, for example, as 110733529 + 95648400 = 10523^2 + 9780^2 .

It is a cyclic number.

It is not a de Polignac number, because 206381929 - 2¹ = 206381927 is a prime.

It is a super-2 number, since 2×206381929² = 85187001235522082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206381891 and 206381900.

It is not an unprimeable number, because it can be changed into a prime (206381927) 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, 7937754 + ... + 7937779.

It is an arithmetic number, because the mean of its divisors is an integer number (55564369).

Almost surely, 2^206381929 is an apocalyptic number.

It is an amenable number.

206381929 is a deficient number, since it is larger than the sum of its proper divisors (15875547).

206381929 is a wasteful number, since it uses less digits than its factorization.

206381929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15875546.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 206381929 is about 14365.9990602812. Note that the first 3 decimals coincide. The cubic root of 206381929 is about 590.9588249329.

The spelling of 206381929 in words is "two hundred six million, three hundred eighty-one thousand, nine hundred twenty-nine".