1820398690 has 32 divisors (see below), whose sum is σ = 3582356544. Its totient is φ = 660527040.

The previous prime is 1820398669. The next prime is 1820398747. The reversal of 1820398690 is 968930281.

It is a super-2 number, since 2×1820398690² = 6627702781107432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1820398690.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33652 + ... + 69088.

It is an arithmetic number, because the mean of its divisors is an integer number (111948642).

Almost surely, 2^1820398690 is an apocalyptic number.

1820398690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820398690 is a deficient number, since it is larger than the sum of its proper divisors (1761957854).

1820398690 is a wasteful number, since it uses less digits than its factorization.

1820398690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35922.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1820398690 is about 42666.1304784017. The cubic root of 1820398690 is about 1221.0182956631.

The spelling of 1820398690 in words is "one billion, eight hundred twenty million, three hundred ninety-eight thousand, six hundred ninety".