685721414 has 16 divisors (see below), whose sum is σ = 1216058400. Its totient is φ = 283746624.

The previous prime is 685721411. The next prime is 685721417. The reversal of 685721414 is 414127586.

It is an interprime number because it is at equal distance from previous prime (685721411) and next prime (685721417).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685721411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844079 + ... + 844890.

It is an arithmetic number, because the mean of its divisors is an integer number (76003650).

Almost surely, 2^685721414 is an apocalyptic number.

685721414 is a deficient number, since it is larger than the sum of its proper divisors (530336986).

685721414 is a wasteful number, since it uses less digits than its factorization.

685721414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689007.

The product of its digits is 53760, while the sum is 38.

The square root of 685721414 is about 26186.2829359190. The cubic root of 685721414 is about 881.8253322428.

The spelling of 685721414 in words is "six hundred eighty-five million, seven hundred twenty-one thousand, four hundred fourteen".