1664079 has 16 divisors (see below), whose sum is σ = 2389248. Its totient is φ = 1026432.

The previous prime is 1664071. The next prime is 1664083. The reversal of 1664079 is 9704661.

It is a happy number.

It is not a de Polignac number, because 1664079 - 2³ = 1664071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664071) 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 15 ways as a sum of consecutive naturals, for example, 3174 + ... + 3660.

It is an arithmetic number, because the mean of its divisors is an integer number (149328).

2^1664079 is an apocalyptic number.

1664079 is a deficient number, since it is larger than the sum of its proper divisors (725169).

1664079 is a wasteful number, since it uses less digits than its factorization.

1664079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1664079 is about 1289.9918604394. The cubic root of 1664079 is about 118.5017180046.

The spelling of 1664079 in words is "one million, six hundred sixty-four thousand, seventy-nine".