1680401 has 2 divisors, whose sum is σ = 1680402. Its totient is φ = 1680400.

The previous prime is 1680377. The next prime is 1680407. The reversal of 1680401 is 1040861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 179776 = 1225^2 + 424^2 .

It is an emirp because it is prime and its reverse (1040861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680401 - 2¹⁴ = 1664017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1680407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840200 + 840201.

It is an arithmetic number, because the mean of its divisors is an integer number (840201).

2^1680401 is an apocalyptic number.

It is an amenable number.

1680401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680401 is an equidigital number, since it uses as much as digits as its factorization.

1680401 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 20.

The square root of 1680401 is about 1296.3028195603. The cubic root of 1680401 is about 118.8878966866.

The spelling of 1680401 in words is "one million, six hundred eighty thousand, four hundred one".