680123438 has 4 divisors (see below), whose sum is σ = 1020185160. Its totient is φ = 340061718.

The previous prime is 680123393. The next prime is 680123447. The reversal of 680123438 is 834321086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834321086 = 2 ⋅417160543.

It is a junction number, because it is equal to n+sod(n) for n = 680123398 and 680123407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170030858 + ... + 170030861.

It is an arithmetic number, because the mean of its divisors is an integer number (255046290).

Almost surely, 2^680123438 is an apocalyptic number.

680123438 is a deficient number, since it is larger than the sum of its proper divisors (340061722).

680123438 is a wasteful number, since it uses less digits than its factorization.

680123438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340061721.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 680123438 is about 26079.1763290178. The cubic root of 680123438 is about 879.4191406105.

Adding to 680123438 its product of nonzero digits (27648), we get a palindrome (680151086).

The spelling of 680123438 in words is "six hundred eighty million, one hundred twenty-three thousand, four hundred thirty-eight".