649842 has 32 divisors (see below), whose sum is σ = 1441152. Its totient is φ = 194304.

The previous prime is 649829. The next prime is 649843. The reversal of 649842 is 248946.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649842.

It is not an unprimeable number, because it can be changed into a prime (649843) 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 in 15 ways as a sum of consecutive naturals, for example, 2208 + ... + 2484.

It is an arithmetic number, because the mean of its divisors is an integer number (45036).

2⁶⁴⁹⁸⁴² is an apocalyptic number.

649842 is an abundant number, since it is smaller than the sum of its proper divisors (791310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649842 is a wasteful number, since it uses less digits than its factorization.

649842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its digits is 13824, while the sum is 33.

The square root of 649842 is about 806.1277814342. The cubic root of 649842 is about 86.6168912074.

The spelling of 649842 in words is "six hundred forty-nine thousand, eight hundred forty-two".