1821336 has 32 divisors (see below), whose sum is σ = 4968000. Its totient is φ = 551840.

The previous prime is 1821331. The next prime is 1821353. The reversal of 1821336 is 6331281.

1821336 = 33² + 34² + ... + 176².

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821331) 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 7 ways as a sum of consecutive naturals, for example, 3186 + ... + 3713.

It is an arithmetic number, because the mean of its divisors is an integer number (155250).

2^1821336 is an apocalyptic number.

It is an amenable number.

1821336 is an abundant number, since it is smaller than the sum of its proper divisors (3146664).

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

1821336 is a wasteful number, since it uses less digits than its factorization.

1821336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6919 (or 6915 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 1821336 is about 1349.5688200310. The cubic root of 1821336 is about 122.1227824175.

The spelling of 1821336 in words is "one million, eight hundred twenty-one thousand, three hundred thirty-six".