1979897 has 2 divisors, whose sum is σ = 1979898. Its totient is φ = 1979896.

The previous prime is 1979893. The next prime is 1979899. The reversal of 1979897 is 7989791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1692601 + 287296 = 1301^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979897 - 2² = 1979893 is a prime.

Together with 1979899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1979891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989948 + 989949.

It is an arithmetic number, because the mean of its divisors is an integer number (989949).

2^1979897 is an apocalyptic number.

It is an amenable number.

1979897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979897 is an equidigital number, since it uses as much as digits as its factorization.

1979897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 50.

The square root of 1979897 is about 1407.0881280147. The cubic root of 1979897 is about 125.5685461218.

The spelling of 1979897 in words is "one million, nine hundred seventy-nine thousand, eight hundred ninety-seven".