1606945 has 8 divisors (see below), whose sum is σ = 1935144. Its totient is φ = 1281024.

The previous prime is 1606921. The next prime is 1606951. The reversal of 1606945 is 5496061.

It can be written as a sum of positive squares in 4 ways, for example, as 279841 + 1327104 = 529^2 + 1152^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1606945 - 2⁷ = 1606817 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 2497 + ... + 3073.

It is an arithmetic number, because the mean of its divisors is an integer number (241893).

2^1606945 is an apocalyptic number.

It is an amenable number.

1606945 is a deficient number, since it is larger than the sum of its proper divisors (328199).

1606945 is an equidigital number, since it uses as much as digits as its factorization.

1606945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1606945 is about 1267.6533437813. The cubic root of 1606945 is about 117.1296927928.

The spelling of 1606945 in words is "one million, six hundred six thousand, nine hundred forty-five".