620401 has 2 divisors, whose sum is σ = 620402. Its totient is φ = 620400.

The previous prime is 620393. The next prime is 620413. The reversal of 620401 is 104026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602176 + 18225 = 776^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 620401 - 2³ = 620393 is a prime.

It is an Ulam number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (620441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310200 + 310201.

It is an arithmetic number, because the mean of its divisors is an integer number (310201).

2⁶²⁰⁴⁰¹ is an apocalyptic number.

It is an amenable number.

620401 is a deficient number, since it is larger than the sum of its proper divisors (1).

620401 is an equidigital number, since it uses as much as digits as its factorization.

620401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 620401 is about 787.6553814962. The cubic root of 620401 is about 85.2885693903.

Adding to 620401 its reverse (104026), we get a palindrome (724427).

The spelling of 620401 in words is "six hundred twenty thousand, four hundred one".