1189897 has 2 divisors, whose sum is σ = 1189898. Its totient is φ = 1189896.

The previous prime is 1189891. The next prime is 1189901. The reversal of 1189897 is 7989811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042441 + 147456 = 1021^2 + 384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1189897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1189891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594948 + 594949.

It is an arithmetic number, because the mean of its divisors is an integer number (594949).

2^1189897 is an apocalyptic number.

It is an amenable number.

1189897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189897 is an equidigital number, since it uses as much as digits as its factorization.

1189897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 43.

The square root of 1189897 is about 1090.8240004694. The cubic root of 1189897 is about 105.9667927308.

The spelling of 1189897 in words is "one million, one hundred eighty-nine thousand, eight hundred ninety-seven".