1820490556 has 12 divisors (see below), whose sum is σ = 3193253280. Its totient is φ = 908132480.

The previous prime is 1820490533. The next prime is 1820490563. The reversal of 1820490556 is 6550940281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526261 + ... + 529708.

It is an arithmetic number, because the mean of its divisors is an integer number (266104440).

Almost surely, 2^1820490556 is an apocalyptic number.

It is an amenable number.

1820490556 is a deficient number, since it is larger than the sum of its proper divisors (1372762724).

1820490556 is a wasteful number, since it uses less digits than its factorization.

1820490556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056404 (or 1056402 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 1820490556 is about 42667.2070330365. The cubic root of 1820490556 is about 1221.0388347865.

The spelling of 1820490556 in words is "one billion, eight hundred twenty million, four hundred ninety thousand, five hundred fifty-six".