1660466 has 4 divisors (see below), whose sum is σ = 2490702. Its totient is φ = 830232.

The previous prime is 1660457. The next prime is 1660469. The reversal of 1660466 is 6640661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6640661 = 79 ⋅84059.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 279841 = 1175^2 + 529^2 .

It is not an unprimeable number, because it can be changed into a prime (1660469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415115 + ... + 415118.

2^1660466 is an apocalyptic number.

1660466 is a deficient number, since it is larger than the sum of its proper divisors (830236).

1660466 is an equidigital number, since it uses as much as digits as its factorization.

1660466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830235.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1660466 is about 1288.5907030551. The cubic root of 1660466 is about 118.4158933650.

The spelling of 1660466 in words is "one million, six hundred sixty thousand, four hundred sixty-six".