649449 has 6 divisors (see below), whose sum is σ = 938106. Its totient is φ = 432960.

The previous prime is 649427. The next prime is 649457. The reversal of 649449 is 944946.

649449 is a `hidden beast` number, since 649 + 4 + 4 + 9 = 666.

649449 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in only one way, i.e., 632025 + 17424 = 795^2 + 132^2 .

It is not a de Polignac number, because 649449 - 2⁷ = 649321 is a prime.

It is an Ulam number.

649449 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (649469) 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 5 ways as a sum of consecutive naturals, for example, 36072 + ... + 36089.

It is an arithmetic number, because the mean of its divisors is an integer number (156351).

2⁶⁴⁹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

649449 is a deficient number, since it is larger than the sum of its proper divisors (288657).

649449 is a wasteful number, since it uses less digits than its factorization.

649449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72167 (or 72164 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 649449 is about 805.8839866879. The cubic root of 649449 is about 86.5994268070.

It can be divided in two parts, 6 and 49449, that added together give a triangular number (49455 = T₃₁₄).

The spelling of 649449 in words is "six hundred forty-nine thousand, four hundred forty-nine".