1820646 has 24 divisors (see below), whose sum is σ = 4042584. Its totient is φ = 591840.

The previous prime is 1820641. The next prime is 1820647. The reversal of 1820646 is 6460281.

1820646 is a `hidden beast` number, since 18 + 2 + 0 + 646 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (168441).

2^1820646 is an apocalyptic number.

1820646 is an abundant number, since it is smaller than the sum of its proper divisors (2221938).

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

1820646 is a wasteful number, since it uses less digits than its factorization.

1820646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516 (or 2513 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1820646 is about 1349.3131586107. The cubic root of 1820646 is about 122.1073586914.

The spelling of 1820646 in words is "one million, eight hundred twenty thousand, six hundred forty-six".