1678998 has 16 divisors (see below), whose sum is σ = 3375216. Its totient is φ = 556800.

The previous prime is 1678993. The next prime is 1679009. The reversal of 1678998 is 8998761.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (210951).

2^1678998 is an apocalyptic number.

1678998 is an abundant number, since it is smaller than the sum of its proper divisors (1696218).

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

1678998 is a wasteful number, since it uses less digits than its factorization.

1678998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439.

The product of its digits is 217728, while the sum is 48.

The square root of 1678998 is about 1295.7615521384. The cubic root of 1678998 is about 118.8548001891.

The spelling of 1678998 in words is "one million, six hundred seventy-eight thousand, nine hundred ninety-eight".