818649 has 12 divisors (see below), whose sum is σ = 1273636. Its totient is φ = 503712.

The previous prime is 818621. The next prime is 818659. The reversal of 818649 is 946818.

It is a happy number.

818649 is a `hidden beast` number, since 8 + 1 + 8 + 649 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 632025 = 432^2 + 795^2 .

It is not a de Polignac number, because 818649 - 2⁸ = 818393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (818659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3382 + ... + 3615.

2⁸¹⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

818649 is a deficient number, since it is larger than the sum of its proper divisors (454987).

818649 is a wasteful number, since it uses less digits than its factorization.

818649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016 (or 7013 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 818649 is about 904.7922413460. The cubic root of 818649 is about 93.5475846133.

It can be divided in two parts, 81 and 8649, that multiplied together give a square (700569 = 837²).

The spelling of 818649 in words is "eight hundred eighteen thousand, six hundred forty-nine".