208531830 has 32 divisors (see below), whose sum is σ = 538975584. Its totient is φ = 51330816.

The previous prime is 208531801. The next prime is 208531847. The reversal of 208531830 is 38135802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266959 + ... + 267738.

It is an arithmetic number, because the mean of its divisors is an integer number (16842987).

Almost surely, 2^208531830 is an apocalyptic number.

208531830 is an abundant number, since it is smaller than the sum of its proper divisors (330443754).

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

208531830 is a wasteful number, since it uses less digits than its factorization.

208531830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534720.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 208531830 is about 14440.6312188907. The cubic root of 208531830 is about 593.0037660421.

The spelling of 208531830 in words is "two hundred eight million, five hundred thirty-one thousand, eight hundred thirty".