1815606 has 24 divisors (see below), whose sum is σ = 4236960. Its totient is φ = 558576.

The previous prime is 1815599. The next prime is 1815629. The reversal of 1815606 is 6065181.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1815606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3646 + ... + 4113.

It is an arithmetic number, because the mean of its divisors is an integer number (176540).

2^1815606 is an apocalyptic number.

1815606 is an abundant number, since it is smaller than the sum of its proper divisors (2421354).

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

1815606 is a wasteful number, since it uses less digits than its factorization.

1815606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780 (or 7777 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1815606 is about 1347.4442474552. Note that the first 3 decimals coincide. The cubic root of 1815606 is about 121.9945800692.

The spelling of 1815606 in words is "one million, eight hundred fifteen thousand, six hundred six".