208297530 has 144 divisors (see below), whose sum is σ = 636222600. Its totient is φ = 47142144.

The previous prime is 208297519. The next prime is 208297541. The reversal of 208297530 is 35792802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (208297519) and next prime (208297541).

It can be written as a sum of positive squares in 4 ways, for example, as 69505569 + 138791961 = 8337^2 + 11781^2 .

It is a super-2 number, since 2×208297530² = 86775722008201800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 656932 + ... + 657248.

Almost surely, 2^208297530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208297530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318111300).

208297530 is an abundant number, since it is smaller than the sum of its proper divisors (427925070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208297530 is a wasteful number, since it uses less digits than its factorization.

208297530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 208297530 is about 14432.5164126011. The cubic root of 208297530 is about 592.7815891663.

The spelling of 208297530 in words is "two hundred eight million, two hundred ninety-seven thousand, five hundred thirty".