208742869 has 4 divisors (see below), whose sum is σ = 209455596. Its totient is φ = 208030144.

The previous prime is 208742803. The next prime is 208742893. The reversal of 208742869 is 968247802.

208742869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968247802 = 2 ⋅484123901.

It can be written as a sum of positive squares in 2 ways, for example, as 181306225 + 27436644 = 13465^2 + 5238^2 .

It is a cyclic number.

It is not a de Polignac number, because 208742869 - 2¹⁵ = 208710101 is a prime.

It is a super-2 number, since 2×208742869² = 87147170716702322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208742069) 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, 355924 + ... + 356509.

It is an arithmetic number, because the mean of its divisors is an integer number (52363899).

Almost surely, 2^208742869 is an apocalyptic number.

It is an amenable number.

208742869 is a deficient number, since it is larger than the sum of its proper divisors (712727).

208742869 is an equidigital number, since it uses as much as digits as its factorization.

208742869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712726.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 208742869 is about 14447.9364962613. The cubic root of 208742869 is about 593.2037430724.

The spelling of 208742869 in words is "two hundred eight million, seven hundred forty-two thousand, eight hundred sixty-nine".