624401 has 2 divisors, whose sum is σ = 624402. Its totient is φ = 624400.

The previous prime is 624391. The next prime is 624419. The reversal of 624401 is 104426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 141376 = 695^2 + 376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624401 is a prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 624401.

It is not a weakly prime, because it can be changed into another prime (624451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312200 + 312201.

It is an arithmetic number, because the mean of its divisors is an integer number (312201).

2⁶²⁴⁴⁰¹ is an apocalyptic number.

It is an amenable number.

624401 is a deficient number, since it is larger than the sum of its proper divisors (1).

624401 is an equidigital number, since it uses as much as digits as its factorization.

624401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 624401 is about 790.1904833646. The cubic root of 624401 is about 85.4714745875.

Adding to 624401 its reverse (104426), we get a palindrome (728827).

The spelling of 624401 in words is "six hundred twenty-four thousand, four hundred one".