1979659 has 4 divisors (see below), whose sum is σ = 2159640. Its totient is φ = 1799680.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979659 is 9569791.

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

It is a cyclic number.

It is not a de Polignac number, because 1979659 - 2⁹ = 1979147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979609) 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, 89974 + ... + 89995.

It is an arithmetic number, because the mean of its divisors is an integer number (539910).

2^1979659 is an apocalyptic number.

1979659 is a deficient number, since it is larger than the sum of its proper divisors (179981).

1979659 is a wasteful number, since it uses less digits than its factorization.

1979659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179980.

The product of its digits is 153090, while the sum is 46.

The square root of 1979659 is about 1407.0035536558. The cubic root of 1979659 is about 125.5635144608.

The spelling of 1979659 in words is "one million, nine hundred seventy-nine thousand, six hundred fifty-nine".