1628401 has 2 divisors, whose sum is σ = 1628402. Its totient is φ = 1628400.

The previous prime is 1628387. The next prime is 1628441. The reversal of 1628401 is 1048261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1628176 + 225 = 1276^2 + 15^2 .

It is an emirp because it is prime and its reverse (1048261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1628401 - 2⁵ = 1628369 is a prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (1628441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814200 + 814201.

It is an arithmetic number, because the mean of its divisors is an integer number (814201).

2^1628401 is an apocalyptic number.

It is an amenable number.

1628401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628401 is an equidigital number, since it uses as much as digits as its factorization.

1628401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1628401 is about 1276.0881630985. The cubic root of 1628401 is about 117.6486966096.

The spelling of 1628401 in words is "one million, six hundred twenty-eight thousand, four hundred one".