686740142 has 16 divisors (see below), whose sum is σ = 1182902400. Its totient is φ = 295725240.

The previous prime is 686740129. The next prime is 686740163. The reversal of 686740142 is 241047686.

It is a super-2 number, since 2×686740142² = 943224045268360328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 686740096 and 686740105.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 821042 + ... + 821877.

It is an arithmetic number, because the mean of its divisors is an integer number (73931400).

Almost surely, 2^686740142 is an apocalyptic number.

686740142 is a deficient number, since it is larger than the sum of its proper divisors (496162258).

686740142 is a wasteful number, since it uses less digits than its factorization.

686740142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642951.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 686740142 is about 26205.7272747772. The cubic root of 686740142 is about 882.2618047610.

The spelling of 686740142 in words is "six hundred eighty-six million, seven hundred forty thousand, one hundred forty-two".