1664872 has 16 divisors (see below), whose sum is σ = 3405600. Its totient is φ = 756720.

The previous prime is 1664869. The next prime is 1664893. The reversal of 1664872 is 2784661.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9372 + ... + 9547.

It is an arithmetic number, because the mean of its divisors is an integer number (212850).

2^1664872 is an apocalyptic number.

It is an amenable number.

1664872 is an abundant number, since it is smaller than the sum of its proper divisors (1740728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664872 is a wasteful number, since it uses less digits than its factorization.

1664872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18936 (or 18932 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 1664872 is about 1290.2991901106. The cubic root of 1664872 is about 118.5205386133.

The spelling of 1664872 in words is "one million, six hundred sixty-four thousand, eight hundred seventy-two".