1678404 has 96 divisors (see below), whose sum is σ = 5080320. Its totient is φ = 419328.

The previous prime is 1678399. The next prime is 1678409. The reversal of 1678404 is 4048761.

It is an interprime number because it is at equal distance from previous prime (1678399) and next prime (1678409).

It is not an unprimeable number, because it can be changed into a prime (1678409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31642 + ... + 31694.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2^1678404 is an apocalyptic number.

1678404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540160).

1678404 is an abundant number, since it is smaller than the sum of its proper divisors (3401916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678404 is a wasteful number, since it uses less digits than its factorization.

1678404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1678404 is about 1295.5323230240. The cubic root of 1678404 is about 118.8407822891.

The spelling of 1678404 in words is "one million, six hundred seventy-eight thousand, four hundred four".