1678969 has 4 divisors (see below), whose sum is σ = 1690240. Its totient is φ = 1667700.

The previous prime is 1678961. The next prime is 1678979. The reversal of 1678969 is 9698761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1678969 - 2³ = 1678961 is a prime.

It is a super-2 number, since 2×1678969² = 5637873805922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5409 + ... + 5710.

It is an arithmetic number, because the mean of its divisors is an integer number (422560).

2^1678969 is an apocalyptic number.

It is an amenable number.

1678969 is a deficient number, since it is larger than the sum of its proper divisors (11271).

1678969 is a wasteful number, since it uses less digits than its factorization.

1678969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11270.

The product of its digits is 163296, while the sum is 46.

The square root of 1678969 is about 1295.7503617595. The cubic root of 1678969 is about 118.8541158903.

The spelling of 1678969 in words is "one million, six hundred seventy-eight thousand, nine hundred sixty-nine".