1855520044 has 18 divisors (see below), whose sum is σ = 3777309060. Its totient is φ = 795222792.

The previous prime is 1855520039. The next prime is 1855520057. The reversal of 1855520044 is 4400255581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1855519991 and 1855520009.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4733274 + ... + 4733665.

Almost surely, 2^1855520044 is an apocalyptic number.

1855520044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1855520044 is an abundant number, since it is smaller than the sum of its proper divisors (1921789016).

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

1855520044 is a wasteful number, since it uses less digits than its factorization.

1855520044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9466957 (or 9466948 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

The square root of 1855520044 is about 43075.7477474274. The cubic root of 1855520044 is about 1228.8207888936.

The spelling of 1855520044 in words is "one billion, eight hundred fifty-five million, five hundred twenty thousand, forty-four".