1821425944 has 32 divisors (see below), whose sum is σ = 3693191040. Its totient is φ = 837158400.

The previous prime is 1821425909. The next prime is 1821426001. The reversal of 1821425944 is 4495241281.

It is a super-2 number, since 2×1821425944² = 6635184938952582272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1821425897 and 1821425906.

It is a congruent number.

It is an unprimeable number.

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, 11272 + ... + 61399.

It is an arithmetic number, because the mean of its divisors is an integer number (115412220).

Almost surely, 2^1821425944 is an apocalyptic number.

It is an amenable number.

1821425944 is an abundant number, since it is smaller than the sum of its proper divisors (1871765096).

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

1821425944 is a wasteful number, since it uses less digits than its factorization.

1821425944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72931 (or 72927 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 1821425944 is about 42678.1670646714. The cubic root of 1821425944 is about 1221.2479266912.

The spelling of 1821425944 in words is "one billion, eight hundred twenty-one million, four hundred twenty-five thousand, nine hundred forty-four".