3649823 has 4 divisors (see below), whose sum is σ = 3668928. Its totient is φ = 3630720.

The previous prime is 3649777. The next prime is 3649831. The reversal of 3649823 is 3289463.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3649823 - 2⁸ = 3649567 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640823) 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, 9263 + ... + 9648.

It is an arithmetic number, because the mean of its divisors is an integer number (917232).

Almost surely, 2^3649823 is an apocalyptic number.

3649823 is a deficient number, since it is larger than the sum of its proper divisors (19105).

3649823 is a wasteful number, since it uses less digits than its factorization.

3649823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19104.

The product of its digits is 31104, while the sum is 35.

The square root of 3649823 is about 1910.4509938755. The cubic root of 3649823 is about 153.9656835889.

The spelling of 3649823 in words is "three million, six hundred forty-nine thousand, eight hundred twenty-three".