208698138 has 96 divisors (see below), whose sum is σ = 515234304. Its totient is φ = 60984000.

The previous prime is 208698089. The next prime is 208698143. The reversal of 208698138 is 831896802.

208698138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 208698093 and 208698102.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 742558 + ... + 742838.

It is an arithmetic number, because the mean of its divisors is an integer number (5367024).

Almost surely, 2^208698138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208698138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257617152).

208698138 is an abundant number, since it is smaller than the sum of its proper divisors (306536166).

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

208698138 is a wasteful number, since it uses less digits than its factorization.

208698138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 208698138 is about 14446.3884067957. The cubic root of 208698138 is about 593.1613679846.

The spelling of 208698138 in words is "two hundred eight million, six hundred ninety-eight thousand, one hundred thirty-eight".