1409666 has 4 divisors (see below), whose sum is σ = 2114502. Its totient is φ = 704832.

The previous prime is 1409659. The next prime is 1409677. The reversal of 1409666 is 6669041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1357225 + 52441 = 1165^2 + 229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352415 + ... + 352418.

2^1409666 is an apocalyptic number.

1409666 is a deficient number, since it is larger than the sum of its proper divisors (704836).

1409666 is an equidigital number, since it uses as much as digits as its factorization.

1409666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704835.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1409666 is about 1187.2935610033. The cubic root of 1409666 is about 112.1257622180.

The spelling of 1409666 in words is "one million, four hundred nine thousand, six hundred sixty-six".