1985897 has 2 divisors, whose sum is σ = 1985898. Its totient is φ = 1985896.

The previous prime is 1985887. The next prime is 1985903. The reversal of 1985897 is 7985891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1371241 + 614656 = 1171^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985897 - 2¹⁶ = 1920361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992948 + 992949.

It is an arithmetic number, because the mean of its divisors is an integer number (992949).

2^1985897 is an apocalyptic number.

It is an amenable number.

1985897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985897 is an equidigital number, since it uses as much as digits as its factorization.

1985897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 1985897 is about 1409.2185777941. The cubic root of 1985897 is about 125.6952617194.

It can be divided in two parts, 1985 and 897, that added together give a palindrome (2882).

The spelling of 1985897 in words is "one million, nine hundred eighty-five thousand, eight hundred ninety-seven".