391681716 has 48 divisors (see below), whose sum is σ = 927553536. Its totient is φ = 128628864.

The previous prime is 391681687. The next prime is 391681729. The reversal of 391681716 is 617186193.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238450 + ... + 240086.

It is an arithmetic number, because the mean of its divisors is an integer number (19324032).

Almost surely, 2^391681716 is an apocalyptic number.

It is an amenable number.

391681716 is an abundant number, since it is smaller than the sum of its proper divisors (535871820).

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

391681716 is a wasteful number, since it uses less digits than its factorization.

391681716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928 (or 1926 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 391681716 is about 19790.9503561603. The cubic root of 391681716 is about 731.6630104015.

The spelling of 391681716 in words is "three hundred ninety-one million, six hundred eighty-one thousand, seven hundred sixteen".