1821145404 has 48 divisors (see below), whose sum is σ = 4618238240. Its totient is φ = 555206400.

The previous prime is 1821145399. The next prime is 1821145411. The reversal of 1821145404 is 4045411281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36547 + ... + 70554.

Almost surely, 2^1821145404 is an apocalyptic number.

It is an amenable number.

1821145404 is an abundant number, since it is smaller than the sum of its proper divisors (2797092836).

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

1821145404 is a wasteful number, since it uses less digits than its factorization.

1821145404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107230 (or 107228 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 1821145404 is about 42674.8802458777. The cubic root of 1821145404 is about 1221.1852237147.

Adding to 1821145404 its reverse (4045411281), we get a palindrome (5866556685).

The spelling of 1821145404 in words is "one billion, eight hundred twenty-one million, one hundred forty-five thousand, four hundred four".