681339838 has 8 divisors (see below), whose sum is σ = 1082128032. Its totient is φ = 320630496.

The previous prime is 681339823. The next prime is 681339863. The reversal of 681339838 is 838933186.

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 = 681339791 and 681339800.

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 3 ways as a sum of consecutive naturals, for example, 10019670 + ... + 10019737.

It is an arithmetic number, because the mean of its divisors is an integer number (135266004).

Almost surely, 2^681339838 is an apocalyptic number.

681339838 is a deficient number, since it is larger than the sum of its proper divisors (400788194).

681339838 is a wasteful number, since it uses less digits than its factorization.

681339838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20039426.

The product of its digits is 746496, while the sum is 49.

The square root of 681339838 is about 26102.4871994988. The cubic root of 681339838 is about 879.9431084088.

The spelling of 681339838 in words is "six hundred eighty-one million, three hundred thirty-nine thousand, eight hundred thirty-eight".