1980679 has 4 divisors (see below), whose sum is σ = 1983520. Its totient is φ = 1977840.

The previous prime is 1980673. The next prime is 1980697. The reversal of 1980679 is 9760891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9760891 = 7 ⋅1394413.

It is a cyclic number.

It is not a de Polignac number, because 1980679 - 2¹¹ = 1978631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980673) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 427 + ... + 2035.

It is an arithmetic number, because the mean of its divisors is an integer number (495880).

2^1980679 is an apocalyptic number.

1980679 is a deficient number, since it is larger than the sum of its proper divisors (2841).

1980679 is a wasteful number, since it uses less digits than its factorization.

1980679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1980679 is about 1407.3659794098. The cubic root of 1980679 is about 125.5850758837.

The spelling of 1980679 in words is "one million, nine hundred eighty thousand, six hundred seventy-nine".