689800138 has 8 divisors (see below), whose sum is σ = 1043857188. Its totient is φ = 341847744.

The previous prime is 689800117. The next prime is 689800147. The reversal of 689800138 is 831008986.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 611424529 + 78375609 = 24727^2 + 8853^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 689800094 and 689800103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1525881 + ... + 1526332.

Almost surely, 2^689800138 is an apocalyptic number.

689800138 is a deficient number, since it is larger than the sum of its proper divisors (354057050).

689800138 is a wasteful number, since it uses less digits than its factorization.

689800138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052328.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 689800138 is about 26264.0464894502. The cubic root of 689800138 is about 883.5702655599.

The spelling of 689800138 in words is "six hundred eighty-nine million, eight hundred thousand, one hundred thirty-eight".