649402 has 8 divisors (see below), whose sum is σ = 1049076. Its totient is φ = 299712.

The previous prime is 649381. The next prime is 649403. The reversal of 649402 is 204946.

It can be written as a sum of positive squares in 2 ways, for example, as 488601 + 160801 = 699^2 + 401^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649403) 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 3 ways as a sum of consecutive naturals, for example, 12463 + ... + 12514.

2⁶⁴⁹⁴⁰² is an apocalyptic number.

649402 is a deficient number, since it is larger than the sum of its proper divisors (399674).

649402 is a wasteful number, since it uses less digits than its factorization.

649402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24992.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 649402 is about 805.8548256355. The cubic root of 649402 is about 86.5973377175.

The spelling of 649402 in words is "six hundred forty-nine thousand, four hundred two".