681846406 has 4 divisors (see below), whose sum is σ = 1022769612. Its totient is φ = 340923202.

The previous prime is 681846379. The next prime is 681846433. The reversal of 681846406 is 604648186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604648186 = 2 ⋅302324093.

It is an interprime number because it is at equal distance from previous prime (681846379) and next prime (681846433).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170461600 + ... + 170461603.

It is an arithmetic number, because the mean of its divisors is an integer number (255692403).

Almost surely, 2^681846406 is an apocalyptic number.

681846406 is a deficient number, since it is larger than the sum of its proper divisors (340923206).

681846406 is a wasteful number, since it uses less digits than its factorization.

681846406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340923205.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 681846406 is about 26112.1888396971. The cubic root of 681846406 is about 880.1611301023.

The spelling of 681846406 in words is "six hundred eighty-one million, eight hundred forty-six thousand, four hundred six".