3649869 has 6 divisors (see below), whose sum is σ = 5272046. Its totient is φ = 2433240.

The previous prime is 3649831. The next prime is 3649871. The reversal of 3649869 is 9689463.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 927369 = 1650^2 + 963^2 .

It is not a de Polignac number, because 3649869 - 2⁷ = 3649741 is a prime.

It is a super-2 number, since 2×3649869² = 26643087434322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3¹³ + 6⁷ + 4⁶ + 9² + 8⁵ + 6⁸ + 9⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649889) 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 5 ways as a sum of consecutive naturals, for example, 202762 + ... + 202779.

Almost surely, 2^3649869 is an apocalyptic number.

It is an amenable number.

3649869 is a deficient number, since it is larger than the sum of its proper divisors (1622177).

3649869 is a wasteful number, since it uses less digits than its factorization.

3649869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405547 (or 405544 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 3649869 is about 1910.4630328797. The cubic root of 3649869 is about 153.9663304140.

The spelling of 3649869 in words is "three million, six hundred forty-nine thousand, eight hundred sixty-nine".