1679998 has 4 divisors (see below), whose sum is σ = 2520000. Its totient is φ = 839998.

The previous prime is 1679981. The next prime is 1680013. The reversal of 1679998 is 8999761.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419998 + ... + 420001.

It is an arithmetic number, because the mean of its divisors is an integer number (630000).

2^1679998 is an apocalyptic number.

1679998 is a deficient number, since it is larger than the sum of its proper divisors (840002).

1679998 is an equidigital number, since it uses as much as digits as its factorization.

1679998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840001.

The product of its digits is 244944, while the sum is 49.

The square root of 1679998 is about 1296.1473681646. The cubic root of 1679998 is about 118.8783918813.

The spelling of 1679998 in words is "one million, six hundred seventy-nine thousand, nine hundred ninety-eight".