1606605 has 64 divisors (see below), whose sum is σ = 3483648. Its totient is φ = 610560.

The previous prime is 1606603. The next prime is 1606639. The reversal of 1606605 is 5066061.

It is not a de Polignac number, because 1606605 - 2¹ = 1606603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606603) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14962 + ... + 15068.

It is an arithmetic number, because the mean of its divisors is an integer number (54432).

2^1606605 is an apocalyptic number.

1606605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606605 is an abundant number, since it is smaller than the sum of its proper divisors (1877043).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1606605 is a wasteful number, since it uses less digits than its factorization.

1606605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1606605 is about 1267.5192306233. The cubic root of 1606605 is about 117.1214313807.

It can be divided in two parts, 1606 and 605, that added together give a triangular number (2211 = T₆₆).

The spelling of 1606605 in words is "one million, six hundred six thousand, six hundred five".