1801897 has 2 divisors, whose sum is σ = 1801898. Its totient is φ = 1801896.

The previous prime is 1801873. The next prime is 1801901. The reversal of 1801897 is 7981081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008016 + 793881 = 1004^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801897 - 2⁷ = 1801769 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900948 + 900949.

It is an arithmetic number, because the mean of its divisors is an integer number (900949).

2^1801897 is an apocalyptic number.

It is an amenable number.

1801897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801897 is an equidigital number, since it uses as much as digits as its factorization.

1801897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1801897 is about 1342.3475704898. The cubic root of 1801897 is about 121.6867580090.

The spelling of 1801897 in words is "one million, eight hundred one thousand, eight hundred ninety-seven".