686135542 has 4 divisors (see below), whose sum is σ = 1029203316. Its totient is φ = 343067770.

The previous prime is 686135539. The next prime is 686135557. The reversal of 686135542 is 245531686.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 686135495 and 686135504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171533884 + ... + 171533887.

It is an arithmetic number, because the mean of its divisors is an integer number (257300829).

Almost surely, 2^686135542 is an apocalyptic number.

686135542 is a deficient number, since it is larger than the sum of its proper divisors (343067774).

686135542 is a wasteful number, since it uses less digits than its factorization.

686135542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343067773.

The product of its digits is 172800, while the sum is 40.

The square root of 686135542 is about 26194.1890884219. The cubic root of 686135542 is about 882.0028168900.

The spelling of 686135542 in words is "six hundred eighty-six million, one hundred thirty-five thousand, five hundred forty-two".