686242402 has 4 divisors (see below), whose sum is σ = 1029363606. Its totient is φ = 343121200.

The previous prime is 686242391. The next prime is 686242409. The reversal of 686242402 is 204242686.

686242402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204242686 = 2 ⋅102121343.

It can be written as a sum of positive squares in only one way, i.e., 404371881 + 281870521 = 20109^2 + 16789^2 .

It is not an unprimeable number, because it can be changed into a prime (686242409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171560599 + ... + 171560602.

Almost surely, 2^686242402 is an apocalyptic number.

686242402 is a deficient number, since it is larger than the sum of its proper divisors (343121204).

686242402 is a wasteful number, since it uses less digits than its factorization.

686242402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343121203.

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 686242402 is about 26196.2287743866. The cubic root of 686242402 is about 882.0486027553.

The spelling of 686242402 in words is "six hundred eighty-six million, two hundred forty-two thousand, four hundred two".