649858 has 16 divisors (see below), whose sum is σ = 1077120. Its totient is φ = 291600.

The previous prime is 649849. The next prime is 649867. The reversal of 649858 is 858946.

It is an interprime number because it is at equal distance from previous prime (649849) and next prime (649867).

It is a super-3 number, since 3×649858³ = 823335162950810136, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 649858.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649858.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2263 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (67320).

2⁶⁴⁹⁸⁵⁸ is an apocalyptic number.

649858 is a deficient number, since it is larger than the sum of its proper divisors (427262).

649858 is a wasteful number, since it uses less digits than its factorization.

649858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its digits is 69120, while the sum is 40.

The square root of 649858 is about 806.1377053581. The cubic root of 649858 is about 86.6176020771.

It can be divided in two parts, 6498 and 58, that added together give a palindrome (6556).

The spelling of 649858 in words is "six hundred forty-nine thousand, eight hundred fifty-eight".