649286138 has 8 divisors (see below), whose sum is σ = 1000251732. Its totient is φ = 315868896.

The previous prime is 649286129. The next prime is 649286189. The reversal of 649286138 is 831682946.

It can be written as a sum of positive squares in 2 ways, for example, as 644804449 + 4481689 = 25393^2 + 2117^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 649286092 and 649286101.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4386995 + ... + 4387142.

Almost surely, 2^649286138 is an apocalyptic number.

649286138 is a deficient number, since it is larger than the sum of its proper divisors (350965594).

649286138 is a wasteful number, since it uses less digits than its factorization.

649286138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8774176.

The product of its digits is 497664, while the sum is 47.

The square root of 649286138 is about 25481.0937363371. The cubic root of 649286138 is about 865.9218737024.

The spelling of 649286138 in words is "six hundred forty-nine million, two hundred eighty-six thousand, one hundred thirty-eight".