1689378 has 8 divisors (see below), whose sum is σ = 3378768. Its totient is φ = 563124.

The previous prime is 1689377. The next prime is 1689379. The reversal of 1689378 is 8739861.

It is an interprime number because it is at equal distance from previous prime (1689377) and next prime (1689379).

It is a sphenic number, since it is the product of 3 distinct primes.

1689378 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1689377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140776 + ... + 140787.

It is an arithmetic number, because the mean of its divisors is an integer number (422346).

2^1689378 is an apocalyptic number.

1689378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1689378 is a wasteful number, since it uses less digits than its factorization.

1689378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281568.

The product of its digits is 72576, while the sum is 42.

The square root of 1689378 is about 1299.7607472147. The cubic root of 1689378 is about 119.0992275490.

The spelling of 1689378 in words is "one million, six hundred eighty-nine thousand, three hundred seventy-eight".