1662506 has 4 divisors (see below), whose sum is σ = 2493762. Its totient is φ = 831252.

The previous prime is 1662503. The next prime is 1662517. The reversal of 1662506 is 6052661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6052661 = 109 ⋅55529.

It can be written as a sum of positive squares in only one way, i.e., 1343281 + 319225 = 1159^2 + 565^2 .

It is not an unprimeable number, because it can be changed into a prime (1662503) 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 as a sum of consecutive naturals, namely, 415625 + ... + 415628.

2^1662506 is an apocalyptic number.

1662506 is a deficient number, since it is larger than the sum of its proper divisors (831256).

1662506 is an equidigital number, since it uses as much as digits as its factorization.

1662506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831255.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1662506 is about 1289.3820225209. The cubic root of 1662506 is about 118.4643676210.

The spelling of 1662506 in words is "one million, six hundred sixty-two thousand, five hundred six".