1679990 has 16 divisors (see below), whose sum is σ = 3256848. Its totient is φ = 620256.

The previous prime is 1679981. The next prime is 1680013. The reversal of 1679990 is 999761.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6332 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (203553).

2^1679990 is an apocalyptic number.

1679990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1679990 is a deficient number, since it is larger than the sum of its proper divisors (1576858).

1679990 is a wasteful number, since it uses less digits than its factorization.

1679990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12943.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 1679990 is about 1296.1442820921. The cubic root of 1679990 is about 118.8782031849.

The spelling of 1679990 in words is "one million, six hundred seventy-nine thousand, nine hundred ninety".