1678444 has 12 divisors (see below), whose sum is σ = 3110184. Its totient is φ = 789824.

The previous prime is 1678429. The next prime is 1678459. The reversal of 1678444 is 4448761.

It is an interprime number because it is at equal distance from previous prime (1678429) and next prime (1678459).

It is a super-2 number, since 2×1678444² = 5634348522272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an Ulam number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12274 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (259182).

2^1678444 is an apocalyptic number.

It is an amenable number.

1678444 is a deficient number, since it is larger than the sum of its proper divisors (1431740).

1678444 is a wasteful number, since it uses less digits than its factorization.

1678444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24704 (or 24702 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 1678444 is about 1295.5477606017. The cubic root of 1678444 is about 118.8417263593.

The spelling of 1678444 in words is "one million, six hundred seventy-eight thousand, four hundred forty-four".