1671678 has 40 divisors (see below), whose sum is σ = 3972672. Its totient is φ = 523584.

The previous prime is 1671671. The next prime is 1671679. The reversal of 1671678 is 8761761.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671671) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2451 + ... + 3057.

2^1671678 is an apocalyptic number.

1671678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1671678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1986336).

1671678 is an abundant number, since it is smaller than the sum of its proper divisors (2300994).

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

1671678 is a wasteful number, since it uses less digits than its factorization.

1671678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 629 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1671678 is about 1292.9338730190. The cubic root of 1671678 is about 118.6818231002.

The spelling of 1671678 in words is "one million, six hundred seventy-one thousand, six hundred seventy-eight".