1855491648 has 56 divisors (see below), whose sum is σ = 4926226368. Its totient is φ = 616367616.

The previous prime is 1855491641. The next prime is 1855491653. The reversal of 1855491648 is 8461945581.

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 1855491648.

It is not an unprimeable number, because it can be changed into a prime (1855491641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39765 + ... + 72747.

It is an arithmetic number, because the mean of its divisors is an integer number (87968328).

Almost surely, 2^1855491648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1855491648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2463113184).

1855491648 is an abundant number, since it is smaller than the sum of its proper divisors (3070734720).

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

1855491648 is a wasteful number, since it uses less digits than its factorization.

1855491648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33291 (or 33281 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The square root of 1855491648 is about 43075.4181407447. The cubic root of 1855491648 is about 1228.8145204312.

The spelling of 1855491648 in words is "one billion, eight hundred fifty-five million, four hundred ninety-one thousand, six hundred forty-eight".