686393741 has 4 divisors (see below), whose sum is σ = 748793184. Its totient is φ = 623994300.

The previous prime is 686393737. The next prime is 686393749. The reversal of 686393741 is 147393686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686393741 - 2² = 686393737 is a prime.

It is a super-2 number, since 2×686393741² = 942272735367950162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686393749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31199705 + ... + 31199726.

It is an arithmetic number, because the mean of its divisors is an integer number (187198296).

Almost surely, 2^686393741 is an apocalyptic number.

It is an amenable number.

686393741 is a deficient number, since it is larger than the sum of its proper divisors (62399443).

686393741 is a wasteful number, since it uses less digits than its factorization.

686393741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62399442.

The product of its digits is 653184, while the sum is 47.

The square root of 686393741 is about 26199.1171797830. The cubic root of 686393741 is about 882.1134382233.

The spelling of 686393741 in words is "six hundred eighty-six million, three hundred ninety-three thousand, seven hundred forty-one".