1505666 has 4 divisors (see below), whose sum is σ = 2258502. Its totient is φ = 752832.

The previous prime is 1505659. The next prime is 1505681. The reversal of 1505666 is 6665051.

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., 1500625 + 5041 = 1225^2 + 71^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 376415 + ... + 376418.

2^1505666 is an apocalyptic number.

1505666 is a deficient number, since it is larger than the sum of its proper divisors (752836).

1505666 is an equidigital number, since it uses as much as digits as its factorization.

1505666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752835.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1505666 is about 1227.0558259509. The cubic root of 1505666 is about 114.6153753989.

The spelling of 1505666 in words is "one million, five hundred five thousand, six hundred sixty-six".