686481542 has 4 divisors (see below), whose sum is σ = 1029722316. Its totient is φ = 343240770.

The previous prime is 686481517. The next prime is 686481553. The reversal of 686481542 is 245184686.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 686481493 and 686481502.

It is a congruent number.

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, 171620384 + ... + 171620387.

It is an arithmetic number, because the mean of its divisors is an integer number (257430579).

Almost surely, 2^686481542 is an apocalyptic number.

686481542 is a deficient number, since it is larger than the sum of its proper divisors (343240774).

686481542 is a wasteful number, since it uses less digits than its factorization.

686481542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343240773.

The product of its digits is 368640, while the sum is 44.

The square root of 686481542 is about 26200.7927742654. The cubic root of 686481542 is about 882.1510488711.

The spelling of 686481542 in words is "six hundred eighty-six million, four hundred eighty-one thousand, five hundred forty-two".