1606805 has 8 divisors (see below), whose sum is σ = 1948632. Its totient is φ = 1271808.

The previous prime is 1606793. The next prime is 1606817. The reversal of 1606805 is 5086061.

It is an interprime number because it is at equal distance from previous prime (1606793) and next prime (1606817).

It can be written as a sum of positive squares in 4 ways, for example, as 438244 + 1168561 = 662^2 + 1081^2 .

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 1606805 - 2⁶ = 1606741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172 + ... + 2141.

It is an arithmetic number, because the mean of its divisors is an integer number (243579).

2^1606805 is an apocalyptic number.

It is an amenable number.

1606805 is a deficient number, since it is larger than the sum of its proper divisors (341827).

1606805 is an equidigital number, since it uses as much as digits as its factorization.

1606805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1606805 is about 1267.5981224347. The cubic root of 1606805 is about 117.1262911760.

The spelling of 1606805 in words is "one million, six hundred six thousand, eight hundred five".