649886 has 8 divisors (see below), whose sum is σ = 993384. Its totient is φ = 318760.

The previous prime is 649879. The next prime is 649897. The reversal of 649886 is 688946.

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

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649886.

It is an unprimeable number.

649886 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2960 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (124173).

2⁶⁴⁹⁸⁸⁶ is an apocalyptic number.

649886 is a deficient number, since it is larger than the sum of its proper divisors (343498).

649886 is a wasteful number, since it uses less digits than its factorization.

649886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6186.

The product of its digits is 82944, while the sum is 41.

The square root of 649886 is about 806.1550719310. The cubic root of 649886 is about 86.6188460709.

Subtracting 649886 from its reverse (688946), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 649886 in words is "six hundred forty-nine thousand, eight hundred eighty-six".