1916857 has 2 divisors, whose sum is σ = 1916858. Its totient is φ = 1916856.

The previous prime is 1916839. The next prime is 1916867. The reversal of 1916857 is 7586191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1585081 + 331776 = 1259^2 + 576^2 .

It is an emirp because it is prime and its reverse (7586191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1916857 - 2⁷ = 1916729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1916867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958428 + 958429.

It is an arithmetic number, because the mean of its divisors is an integer number (958429).

2^1916857 is an apocalyptic number.

It is an amenable number.

1916857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916857 is an equidigital number, since it uses as much as digits as its factorization.

1916857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 1916857 is about 1384.5060491020. The cubic root of 1916857 is about 124.2214435330.

The spelling of 1916857 in words is "one million, nine hundred sixteen thousand, eight hundred fifty-seven".