648401 has 4 divisors (see below), whose sum is σ = 698292. Its totient is φ = 598512.

The previous prime is 648391. The next prime is 648433. The reversal of 648401 is 104846.

It is a happy number.

648401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46225 + 602176 = 215^2 + 776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648401.

It is not an unprimeable number, because it can be changed into a prime (648481) 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, 24926 + ... + 24951.

It is an arithmetic number, because the mean of its divisors is an integer number (174573).

2⁶⁴⁸⁴⁰¹ is an apocalyptic number.

It is an amenable number.

648401 is a deficient number, since it is larger than the sum of its proper divisors (49891).

648401 is a wasteful number, since it uses less digits than its factorization.

648401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49890.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 648401 is about 805.2335065060. The cubic root of 648401 is about 86.5528206018.

The spelling of 648401 in words is "six hundred forty-eight thousand, four hundred one".