6649369 has 4 divisors (see below), whose sum is σ = 6938496. Its totient is φ = 6360244.

The previous prime is 6649367. The next prime is 6649387. The reversal of 6649369 is 9639466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9639466 = 2 ⋅4819733.

It is a cyclic number.

It is not a de Polignac number, because 6649369 - 2¹ = 6649367 is a prime.

It is a super-2 number, since 2×6649369² = 88428216196322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 6⁵ + 4¹¹ + 9⁵ + 3¹¹ + 6⁸ + 9⁶ .

It is a Duffinian number.

6649369 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6649367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144529 + ... + 144574.

It is an arithmetic number, because the mean of its divisors is an integer number (1734624).

Almost surely, 2^6649369 is an apocalyptic number.

It is an amenable number.

6649369 is a deficient number, since it is larger than the sum of its proper divisors (289127).

6649369 is a wasteful number, since it uses less digits than its factorization.

6649369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289126.

The product of its digits is 209952, while the sum is 43.

The square root of 6649369 is about 2578.6370430908. The cubic root of 6649369 is about 188.0442875141.

The spelling of 6649369 in words is "six million, six hundred forty-nine thousand, three hundred sixty-nine".