1845438220 has 24 divisors (see below), whose sum is σ = 3891511008. Its totient is φ = 735110400.

The previous prime is 1845438193. The next prime is 1845438263. The reversal of 1845438220 is 228345481.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1845438220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186616 + ... + 196255.

It is an arithmetic number, because the mean of its divisors is an integer number (162146292).

Almost surely, 2^1845438220 is an apocalyptic number.

1845438220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1845438220 is an abundant number, since it is smaller than the sum of its proper divisors (2046072788).

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

1845438220 is a wasteful number, since it uses less digits than its factorization.

1845438220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383121 (or 383119 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 1845438220 is about 42958.5639890348. The cubic root of 1845438220 is about 1226.5911784372.

It can be divided in two parts, 184 and 5438220, that multiplied together give a triangular number (1000632480 = T₄₄₇₃₅).

The spelling of 1845438220 in words is "one billion, eight hundred forty-five million, four hundred thirty-eight thousand, two hundred twenty".