1820436 has 12 divisors (see below), whose sum is σ = 4247712. Its totient is φ = 606808.

The previous prime is 1820431. The next prime is 1820449. The reversal of 1820436 is 6340281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 75840 + ... + 75863.

It is an arithmetic number, because the mean of its divisors is an integer number (353976).

2^1820436 is an apocalyptic number.

It is an amenable number.

1820436 is an abundant number, since it is smaller than the sum of its proper divisors (2427276).

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

1820436 is a wasteful number, since it uses less digits than its factorization.

1820436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151710 (or 151708 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1820436 is about 1349.2353389976. The cubic root of 1820436 is about 122.1026637404.

The spelling of 1820436 in words is "one million, eight hundred twenty thousand, four hundred thirty-six".