1840201820 has 48 divisors (see below), whose sum is σ = 3910915008. Its totient is φ = 727257600.

The previous prime is 1840201789. The next prime is 1840201837. The reversal of 1840201820 is 281020481.

It is a self number, because there is not a number n which added to its sum of digits gives 1840201820.

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, 1730609 + ... + 1731671.

It is an arithmetic number, because the mean of its divisors is an integer number (81477396).

Almost surely, 2^1840201820 is an apocalyptic number.

1840201820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1840201820 is an abundant number, since it is smaller than the sum of its proper divisors (2070713188).

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

1840201820 is a wasteful number, since it uses less digits than its factorization.

1840201820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 1840201820 is about 42897.5735910552. The cubic root of 1840201820 is about 1225.4299354418.

The spelling of 1840201820 in words is "one billion, eight hundred forty million, two hundred one thousand, eight hundred twenty".