1816203860 has 12 divisors (see below), whose sum is σ = 3814028148. Its totient is φ = 726481536.

The previous prime is 1816203853. The next prime is 1816203871. The reversal of 1816203860 is 683026181.

It can be written as a sum of positive squares in 2 ways, for example, as 1153553296 + 662650564 = 33964^2 + 25742^2 .

It is a super-2 number, since 2×1816203860² = 6597192922157799200, 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 1816203860.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 45405077 + ... + 45405116.

It is an arithmetic number, because the mean of its divisors is an integer number (317835679).

Almost surely, 2^1816203860 is an apocalyptic number.

1816203860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1816203860 is an abundant number, since it is smaller than the sum of its proper divisors (1997824288).

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

1816203860 is a wasteful number, since it uses less digits than its factorization.

1816203860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90810202 (or 90810200 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1816203860 is about 42616.9433441677. The cubic root of 1816203860 is about 1220.0796911126.

The spelling of 1816203860 in words is "one billion, eight hundred sixteen million, two hundred three thousand, eight hundred sixty".