1821245924 has 6 divisors (see below), whose sum is σ = 3187180374. Its totient is φ = 910622960.

The previous prime is 1821245873. The next prime is 1821245927. The reversal of 1821245924 is 4295421281.

It can be written as a sum of positive squares in only one way, i.e., 1531156900 + 290089024 = 39130^2 + 17032^2 .

It is a super-2 number, since 2×1821245924² = 6633873431373227552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1821245927) by changing a digit.

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, 227655737 + ... + 227655744.

It is an arithmetic number, because the mean of its divisors is an integer number (531196729).

Almost surely, 2^1821245924 is an apocalyptic number.

It is an amenable number.

1821245924 is a deficient number, since it is larger than the sum of its proper divisors (1365934450).

1821245924 is a wasteful number, since it uses less digits than its factorization.

1821245924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455311485 (or 455311483 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 1821245924 is about 42676.0579716543. The cubic root of 1821245924 is about 1221.2076914942.

The spelling of 1821245924 in words is "one billion, eight hundred twenty-one million, two hundred forty-five thousand, nine hundred twenty-four".