686456402 has 4 divisors (see below), whose sum is σ = 1029684606. Its totient is φ = 343228200.

The previous prime is 686456369. The next prime is 686456423. The reversal of 686456402 is 204654686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204654686 = 2 ⋅102327343.

It can be written as a sum of positive squares in only one way, i.e., 670861801 + 15594601 = 25901^2 + 3949^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 686456402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171614099 + ... + 171614102.

Almost surely, 2^686456402 is an apocalyptic number.

686456402 is a deficient number, since it is larger than the sum of its proper divisors (343228204).

686456402 is a wasteful number, since it uses less digits than its factorization.

686456402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343228203.

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 686456402 is about 26200.3130133974. The cubic root of 686456402 is about 882.1402801678.

The spelling of 686456402 in words is "six hundred eighty-six million, four hundred fifty-six thousand, four hundred two".