206439157 has 4 divisors (see below), whose sum is σ = 206492076. Its totient is φ = 206386240.

The previous prime is 206439097. The next prime is 206439203. The reversal of 206439157 is 751934602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 170929476 + 35509681 = 13074^2 + 5959^2 .

It is a cyclic number.

It is not a de Polignac number, because 206439157 - 2⁷ = 206439029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206431157) 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, 20098 + ... + 28579.

It is an arithmetic number, because the mean of its divisors is an integer number (51623019).

Almost surely, 2^206439157 is an apocalyptic number.

It is an amenable number.

206439157 is a deficient number, since it is larger than the sum of its proper divisors (52919).

206439157 is an equidigital number, since it uses as much as digits as its factorization.

206439157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52918.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 206439157 is about 14367.9907085159. The cubic root of 206439157 is about 591.0134425478.

The spelling of 206439157 in words is "two hundred six million, four hundred thirty-nine thousand, one hundred fifty-seven".