208390253 has 8 divisors (see below), whose sum is σ = 216957048. Its totient is φ = 199977984.

The previous prime is 208390243. The next prime is 208390261. The reversal of 208390253 is 352093802.

It can be written as a sum of positive squares in 4 ways, for example, as 103266244 + 105124009 = 10162^2 + 10253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208390253 - 2¹⁶ = 208324717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208390243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35876 + ... + 41277.

It is an arithmetic number, because the mean of its divisors is an integer number (27119631).

Almost surely, 2^208390253 is an apocalyptic number.

It is an amenable number.

208390253 is a deficient number, since it is larger than the sum of its proper divisors (8566795).

208390253 is an equidigital number, since it uses as much as digits as its factorization.

208390253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77263.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 208390253 is about 14435.7283501734. The cubic root of 208390253 is about 592.8695344139.

The spelling of 208390253 in words is "two hundred eight million, three hundred ninety thousand, two hundred fifty-three".