649898 has 4 divisors (see below), whose sum is σ = 974850. Its totient is φ = 324948.

The previous prime is 649897. The next prime is 649907. The reversal of 649898 is 898946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 898946 = 2 ⋅449473.

It can be written as a sum of positive squares in only one way, i.e., 332929 + 316969 = 577^2 + 563^2 .

It is not an unprimeable number, because it can be changed into a prime (649897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162473 + ... + 162476.

2⁶⁴⁹⁸⁹⁸ is an apocalyptic number.

649898 is a deficient number, since it is larger than the sum of its proper divisors (324952).

649898 is a wasteful number, since it uses less digits than its factorization.

649898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324951.

The product of its digits is 124416, while the sum is 44.

The square root of 649898 is about 806.1625146334. The cubic root of 649898 is about 86.6193792002.

It can be divided in two parts, 6498 and 98, that multiplied together give a square (636804 = 798²).

The spelling of 649898 in words is "six hundred forty-nine thousand, eight hundred ninety-eight".