1664996 has 6 divisors (see below), whose sum is σ = 2913750. Its totient is φ = 832496.

The previous prime is 1664987. The next prime is 1665007. The reversal of 1664996 is 6994661.

It can be written as a sum of positive squares in only one way, i.e., 1132096 + 532900 = 1064^2 + 730^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208121 + ... + 208128.

It is an arithmetic number, because the mean of its divisors is an integer number (485625).

2^1664996 is an apocalyptic number.

It is an amenable number.

1664996 is a deficient number, since it is larger than the sum of its proper divisors (1248754).

1664996 is a wasteful number, since it uses less digits than its factorization.

1664996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416253 (or 416251 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 1664996 is about 1290.3472400869. The cubic root of 1664996 is about 118.5234810181.

The spelling of 1664996 in words is "one million, six hundred sixty-four thousand, nine hundred ninety-six".