684381407 has 4 divisors (see below), whose sum is σ = 686852376. Its totient is φ = 681910440.

The previous prime is 684381403. The next prime is 684381413. The reversal of 684381407 is 704183486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684381407 - 2² = 684381403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684381403) by changing a digit.

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, 1235069 + ... + 1235622.

It is an arithmetic number, because the mean of its divisors is an integer number (171713094).

Almost surely, 2^684381407 is an apocalyptic number.

684381407 is a deficient number, since it is larger than the sum of its proper divisors (2470969).

684381407 is a wasteful number, since it uses less digits than its factorization.

684381407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470968.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 684381407 is about 26160.6843756045. The cubic root of 684381407 is about 881.2505494221.

The spelling of 684381407 in words is "six hundred eighty-four million, three hundred eighty-one thousand, four hundred seven".