1821942548 has 6 divisors (see below), whose sum is σ = 3188399466. Its totient is φ = 910971272.

The previous prime is 1821942527. The next prime is 1821942559. The reversal of 1821942548 is 8452491281.

It can be written as a sum of positive squares in only one way, i.e., 1629898384 + 192044164 = 40372^2 + 13858^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1821942499 and 1821942508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227742815 + ... + 227742822.

It is an arithmetic number, because the mean of its divisors is an integer number (531399911).

Almost surely, 2^1821942548 is an apocalyptic number.

It is an amenable number.

1821942548 is a deficient number, since it is larger than the sum of its proper divisors (1366456918).

1821942548 is a wasteful number, since it uses less digits than its factorization.

1821942548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455485641 (or 455485639 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The square root of 1821942548 is about 42684.2189573617. The cubic root of 1821942548 is about 1221.3633750535.

The spelling of 1821942548 in words is "one billion, eight hundred twenty-one million, nine hundred forty-two thousand, five hundred forty-eight".