1820490555 has 16 divisors (see below), whose sum is σ = 3136845600. Its totient is φ = 896241408.

The previous prime is 1820490533. The next prime is 1820490563. The reversal of 1820490555 is 5550940281.

It is not a de Polignac number, because 1820490555 - 2⁵ = 1820490523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4667730 + ... + 4668119.

It is an arithmetic number, because the mean of its divisors is an integer number (196052850).

Almost surely, 2^1820490555 is an apocalyptic number.

1820490555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1820490555 is a deficient number, since it is larger than the sum of its proper divisors (1316355045).

1820490555 is a wasteful number, since it uses less digits than its factorization.

1820490555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335870.

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 1820490555 is about 42667.2070213179. The cubic root of 1820490555 is about 1221.0388345629.

The spelling of 1820490555 in words is "one billion, eight hundred twenty million, four hundred ninety thousand, five hundred fifty-five".