649642 has 16 divisors (see below), whose sum is σ = 1137600. Its totient is φ = 278124.

The previous prime is 649639. The next prime is 649643. The reversal of 649642 is 246946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649643) 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 7 ways as a sum of consecutive naturals, for example, 213 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (71100).

2⁶⁴⁹⁶⁴² is an apocalyptic number.

649642 is a deficient number, since it is larger than the sum of its proper divisors (487958).

649642 is an equidigital number, since it uses as much as digits as its factorization.

649642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 956 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 649642 is about 806.0037220758. The cubic root of 649642 is about 86.6080043520.

The spelling of 649642 in words is "six hundred forty-nine thousand, six hundred forty-two".