649623 has 8 divisors (see below), whose sum is σ = 932848. Its totient is φ = 399744.

The previous prime is 649619. The next prime is 649631. The reversal of 649623 is 326946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649623 - 2² = 649619 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8290 + ... + 8367.

It is an arithmetic number, because the mean of its divisors is an integer number (116606).

2⁶⁴⁹⁶²³ is an apocalyptic number.

649623 is a deficient number, since it is larger than the sum of its proper divisors (283225).

649623 is a wasteful number, since it uses less digits than its factorization.

649623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16673.

The product of its digits is 7776, while the sum is 30.

The square root of 649623 is about 805.9919354435. The cubic root of 649623 is about 86.6071600059.

The spelling of 649623 in words is "six hundred forty-nine thousand, six hundred twenty-three".