686057929 has 4 divisors (see below), whose sum is σ = 686188800. Its totient is φ = 685927060.

The previous prime is 686057927. The next prime is 686057987. The reversal of 686057929 is 929750686.

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 686057929 - 2¹ = 686057927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686057921) 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, 57229 + ... + 68170.

It is an arithmetic number, because the mean of its divisors is an integer number (171547200).

Almost surely, 2^686057929 is an apocalyptic number.

It is an amenable number.

686057929 is a deficient number, since it is larger than the sum of its proper divisors (130871).

686057929 is a wasteful number, since it uses less digits than its factorization.

686057929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130870.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 686057929 is about 26192.7075538212. The cubic root of 686057929 is about 881.9695593863.

The spelling of 686057929 in words is "six hundred eighty-six million, fifty-seven thousand, nine hundred twenty-nine".