1660816 has 10 divisors (see below), whose sum is σ = 3217862. Its totient is φ = 830400.

The previous prime is 1660793. The next prime is 1660837. The reversal of 1660816 is 6180661.

It can be written as a sum of positive squares in only one way, i.e., 1430416 + 230400 = 1196^2 + 480^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51885 + ... + 51916.

2^1660816 is an apocalyptic number.

1660816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1660816 is a deficient number, since it is larger than the sum of its proper divisors (1557046).

1660816 is a wasteful number, since it uses less digits than its factorization.

1660816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103809 (or 103803 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1660816 is about 1288.7265031806. The cubic root of 1660816 is about 118.4242128470.

The spelling of 1660816 in words is "one million, six hundred sixty thousand, eight hundred sixteen".