686942619 has 16 divisors (see below), whose sum is σ = 1007063040. Its totient is φ = 413048160.

The previous prime is 686942617. The next prime is 686942653. The reversal of 686942619 is 916249686.

It is not a de Polignac number, because 686942619 - 2¹ = 686942617 is a prime.

It is a super-2 number, since 2×686942619² = 943780323597158322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686942617) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 77764 + ... + 86145.

It is an arithmetic number, because the mean of its divisors is an integer number (62941440).

Almost surely, 2^686942619 is an apocalyptic number.

686942619 is a deficient number, since it is larger than the sum of its proper divisors (320120421).

686942619 is a wasteful number, since it uses less digits than its factorization.

686942619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164050.

The product of its digits is 1119744, while the sum is 51.

The square root of 686942619 is about 26209.5902104554. The cubic root of 686942619 is about 882.3485043042.

The spelling of 686942619 in words is "six hundred eighty-six million, nine hundred forty-two thousand, six hundred nineteen".