686036426 has 4 divisors (see below), whose sum is σ = 1029054642. Its totient is φ = 343018212.

The previous prime is 686036371. The next prime is 686036437. The reversal of 686036426 is 624630686.

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

It can be written as a sum of positive squares in only one way, i.e., 681262201 + 4774225 = 26101^2 + 2185^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171509105 + ... + 171509108.

Almost surely, 2^686036426 is an apocalyptic number.

686036426 is a deficient number, since it is larger than the sum of its proper divisors (343018216).

686036426 is a wasteful number, since it uses less digits than its factorization.

686036426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343018215.

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 686036426 is about 26192.2970737582. The cubic root of 686036426 is about 881.9603448148.

The spelling of 686036426 in words is "six hundred eighty-six million, thirty-six thousand, four hundred twenty-six".