1979661 has 8 divisors (see below), whose sum is σ = 2673280. Its totient is φ = 1302912.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979661 is 1669791.

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

It is not a de Polignac number, because 1979661 - 2⁹ = 1979149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979261) 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 7 ways as a sum of consecutive naturals, for example, 3940 + ... + 4413.

It is an arithmetic number, because the mean of its divisors is an integer number (334160).

2^1979661 is an apocalyptic number.

It is an amenable number.

1979661 is a deficient number, since it is larger than the sum of its proper divisors (693619).

1979661 is an equidigital number, since it uses as much as digits as its factorization.

1979661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435.

The product of its digits is 20412, while the sum is 39.

The square root of 1979661 is about 1407.0042643859. The cubic root of 1979661 is about 125.5635567454.

The spelling of 1979661 in words is "one million, nine hundred seventy-nine thousand, six hundred sixty-one".