1916289 has 12 divisors (see below), whose sum is σ = 2788500. Its totient is φ = 1268064.

The previous prime is 1916287. The next prime is 1916293. The reversal of 1916289 is 9826191.

It can be written as a sum of positive squares in 2 ways, for example, as 173889 + 1742400 = 417^2 + 1320^2 .

It is not a de Polignac number, because 1916289 - 2¹ = 1916287 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1916281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627 + ... + 2055.

It is an arithmetic number, because the mean of its divisors is an integer number (232375).

2^1916289 is an apocalyptic number.

It is an amenable number.

1916289 is a deficient number, since it is larger than the sum of its proper divisors (872211).

1916289 is a wasteful number, since it uses less digits than its factorization.

1916289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584 (or 1581 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1916289 is about 1384.3009065951. The cubic root of 1916289 is about 124.2091726210.

The spelling of 1916289 in words is "one million, nine hundred sixteen thousand, two hundred eighty-nine".