1678289 has 6 divisors (see below), whose sum is σ = 1771650. Its totient is φ = 1589616.

The previous prime is 1678277. The next prime is 1678301. The reversal of 1678289 is 9828761.

It is an interprime number because it is at equal distance from previous prime (1678277) and next prime (1678301).

It can be written as a sum of positive squares in only one way, i.e., 1669264 + 9025 = 1292^2 + 95^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1678289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1964 + ... + 2685.

It is an arithmetic number, because the mean of its divisors is an integer number (295275).

2^1678289 is an apocalyptic number.

1678289 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1678289 is a deficient number, since it is larger than the sum of its proper divisors (93361).

1678289 is an equidigital number, since it uses as much as digits as its factorization.

1678289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687 (or 4668 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 1678289 is about 1295.4879389635. The cubic root of 1678289 is about 118.8380680037.

The spelling of 1678289 in words is "one million, six hundred seventy-eight thousand, two hundred eighty-nine".