1979666 has 12 divisors (see below), whose sum is σ = 3216042. Its totient is φ = 913536.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979666 is 6669791.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1510441 + 469225 = 1229^2 + 685^2 .

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2591 + ... + 3266.

2^1979666 is an apocalyptic number.

1979666 is a deficient number, since it is larger than the sum of its proper divisors (1236376).

1979666 is a wasteful number, since it uses less digits than its factorization.

1979666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885 (or 5872 counting only the distinct ones).

The product of its digits is 122472, while the sum is 44.

The square root of 1979666 is about 1407.0060412095. The cubic root of 1979666 is about 125.5636624566.

It can be divided in two parts, 19796 and 66, that multiplied together give a triangular number (1306536 = T₁₆₁₆).

The spelling of 1979666 in words is "one million, nine hundred seventy-nine thousand, six hundred sixty-six".