1660090 has 16 divisors (see below), whose sum is σ = 3061800. Its totient is φ = 647680.

The previous prime is 1660073. The next prime is 1660097. The reversal of 1660090 is 900661.

It can be written as a sum of positive squares in 4 ways, for example, as 674041 + 986049 = 821^2 + 993^2 .

It is not an unprimeable number, because it can be changed into a prime (1660097) 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 7 ways as a sum of consecutive naturals, for example, 1615 + ... + 2434.

2^1660090 is an apocalyptic number.

1660090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1660090 is a deficient number, since it is larger than the sum of its proper divisors (1401710).

1660090 is a wasteful number, since it uses less digits than its factorization.

1660090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1660090 is about 1288.4447989728. Note that the first 3 decimals coincide. The cubic root of 1660090 is about 118.4069545617.

It can be divided in two parts, 16 and 60090, that added together give a palindrome (60106).

The spelling of 1660090 in words is "one million, six hundred sixty thousand, ninety".