1918897 has 2 divisors, whose sum is σ = 1918898. Its totient is φ = 1918896.

The previous prime is 1918879. The next prime is 1918919. The reversal of 1918897 is 7988191.

Together with previous prime (1918879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1354896 + 564001 = 1164^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918897 - 2⁷ = 1918769 is a prime.

1918897 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1918817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959448 + 959449.

It is an arithmetic number, because the mean of its divisors is an integer number (959449).

2^1918897 is an apocalyptic number.

It is an amenable number.

1918897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918897 is an equidigital number, since it uses as much as digits as its factorization.

1918897 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 1918897 is about 1385.2425780346. The cubic root of 1918897 is about 124.2654951412.

The spelling of 1918897 in words is "one million, nine hundred eighteen thousand, eight hundred ninety-seven".