655401 has 16 divisors (see below), whose sum is σ = 943488. Its totient is φ = 403200.

The previous prime is 655399. The next prime is 655439. The reversal of 655401 is 104556.

It is a happy number.

It is not a de Polignac number, because 655401 - 2¹ = 655399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3531 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (58968).

2⁶⁵⁵⁴⁰¹ is an apocalyptic number.

It is an amenable number.

655401 is a deficient number, since it is larger than the sum of its proper divisors (288087).

655401 is a wasteful number, since it uses less digits than its factorization.

655401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 655401 is about 809.5684035336. The cubic root of 655401 is about 86.8631750722.

Adding to 655401 its reverse (104556), we get a palindrome (759957).

The spelling of 655401 in words is "six hundred fifty-five thousand, four hundred one".