684040971 has 8 divisors (see below), whose sum is σ = 918176400. Its totient is φ = 452966432.

The previous prime is 684040967. The next prime is 684040979. The reversal of 684040971 is 179040486.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 684040971 - 2² = 684040967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684040979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764700 + ... + 765593.

It is an arithmetic number, because the mean of its divisors is an integer number (114772050).

Almost surely, 2^684040971 is an apocalyptic number.

684040971 is a deficient number, since it is larger than the sum of its proper divisors (234135429).

684040971 is a wasteful number, since it uses less digits than its factorization.

684040971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530445.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 684040971 is about 26154.1769321843. The cubic root of 684040971 is about 881.1044032488.

The spelling of 684040971 in words is "six hundred eighty-four million, forty thousand, nine hundred seventy-one".