208639340 has 192 divisors, whose sum is σ = 575769600. Its totient is φ = 61737984.

The previous prime is 208639313. The next prime is 208639363. The reversal of 208639340 is 43936802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 208639340.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3113987 + ... + 3114053.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^208639340 is an apocalyptic number.

208639340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208639340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287884800).

208639340 is an abundant number, since it is smaller than the sum of its proper divisors (367130260).

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

208639340 is a wasteful number, since it uses less digits than its factorization.

208639340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 208639340 is about 14444.3532219342. The cubic root of 208639340 is about 593.1056575723.

It can be divided in two parts, 20863 and 9340, that added together give a palindrome (30203).

The spelling of 208639340 in words is "two hundred eight million, six hundred thirty-nine thousand, three hundred forty".