649408 has 28 divisors (see below), whose sum is σ = 1315720. Its totient is φ = 317952.

The previous prime is 649403. The next prime is 649421. The reversal of 649408 is 804946.

It is a self number, because there is not a number n which added to its sum of digits gives 649408.

It is not an unprimeable number, because it can be changed into a prime (649403) 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, 4603 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (46990).

2⁶⁴⁹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657860).

649408 is an abundant number, since it is smaller than the sum of its proper divisors (666312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649408 is a wasteful number, since it uses less digits than its factorization.

649408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 649408 is about 805.8585483818. The cubic root of 649408 is about 86.5976044154.

The spelling of 649408 in words is "six hundred forty-nine thousand, four hundred eight".