1660979 has 4 divisors (see below), whose sum is σ = 1663584. Its totient is φ = 1658376.

The previous prime is 1660963. The next prime is 1661003. The reversal of 1660979 is 9790661.

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: 9790661 = 29 ⋅337609.

It is a cyclic number.

It is not a de Polignac number, because 1660979 - 2⁴ = 1660963 is a prime.

It is a super-4 number, since 4×1660979⁴ (a number of 26 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374 + ... + 1860.

It is an arithmetic number, because the mean of its divisors is an integer number (415896).

2^1660979 is an apocalyptic number.

1660979 is a deficient number, since it is larger than the sum of its proper divisors (2605).

1660979 is a wasteful number, since it uses less digits than its factorization.

1660979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1660979 is about 1288.7897423552. The cubic root of 1660979 is about 118.4280869497.

The spelling of 1660979 in words is "one million, six hundred sixty thousand, nine hundred seventy-nine".