1979665 has 8 divisors (see below), whose sum is σ = 2385000. Its totient is φ = 1577472.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979665 is 5669791.

It can be written as a sum of positive squares in 4 ways, for example, as 16 + 1979649 = 4^2 + 1407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1979665 - 2¹¹ = 1977617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (298125).

2^1979665 is an apocalyptic number.

It is an amenable number.

1979665 is a deficient number, since it is larger than the sum of its proper divisors (405335).

1979665 is a wasteful number, since it uses less digits than its factorization.

1979665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 102060, while the sum is 43.

The square root of 1979665 is about 1407.0056858449. The cubic root of 1979665 is about 125.5636413144.

The spelling of 1979665 in words is "one million, nine hundred seventy-nine thousand, six hundred sixty-five".