1897979 has 2 divisors, whose sum is σ = 1897980. Its totient is φ = 1897978.

The previous prime is 1897969. The next prime is 1897991. The reversal of 1897979 is 9797981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1897979 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1897939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948989 + 948990.

It is an arithmetic number, because the mean of its divisors is an integer number (948990).

2^1897979 is an apocalyptic number.

1897979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897979 is an equidigital number, since it uses as much as digits as its factorization.

1897979 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 1897979 is about 1377.6715864095. The cubic root of 1897979 is about 123.8123027436.

The spelling of 1897979 in words is "one million, eight hundred ninety-seven thousand, nine hundred seventy-nine".