1821853224 has 48 divisors (see below), whose sum is σ = 4985072820. Its totient is φ = 601021440.

The previous prime is 1821853223. The next prime is 1821853259. The reversal of 1821853224 is 4223581281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1638792324 + 183060900 = 40482^2 + 13530^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1821853223) 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, 123447 + ... + 137414.

Almost surely, 2^1821853224 is an apocalyptic number.

It is an amenable number.

1821853224 is an abundant number, since it is smaller than the sum of its proper divisors (3163219596).

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

1821853224 is a wasteful number, since it uses less digits than its factorization.

1821853224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260970 (or 260963 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 1821853224 is about 42683.1726093551. The cubic root of 1821853224 is about 1221.3434148842.

The spelling of 1821853224 in words is "one billion, eight hundred twenty-one million, eight hundred fifty-three thousand, two hundred twenty-four".