1905606 has 28 divisors (see below), whose sum is σ = 4288932. Its totient is φ = 634716.

The previous prime is 1905599. The next prime is 1905613. The reversal of 1905606 is 6065091.

It is an interprime number because it is at equal distance from previous prime (1905599) and next prime (1905613).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1905606.

It is a congruent number.

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 in 13 ways as a sum of consecutive naturals, for example, 805 + ... + 2111.

2^1905606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1905606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144466).

1905606 is an abundant number, since it is smaller than the sum of its proper divisors (2383326).

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

1905606 is an equidigital number, since it uses as much as digits as its factorization.

1905606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1905606 is about 1380.4368873657. The cubic root of 1905606 is about 123.9779270458.

The spelling of 1905606 in words is "one million, nine hundred five thousand, six hundred six".