1855239672 has 128 divisors (see below), whose sum is σ = 5489568000. Its totient is φ = 515082240.

The previous prime is 1855239637. The next prime is 1855239679. The reversal of 1855239672 is 2769325581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855239679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475104 + ... + 478992.

It is an arithmetic number, because the mean of its divisors is an integer number (42887250).

Almost surely, 2^1855239672 is an apocalyptic number.

1855239672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1855239672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2744784000).

1855239672 is an abundant number, since it is smaller than the sum of its proper divisors (3634328328).

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

1855239672 is a wasteful number, since it uses less digits than its factorization.

1855239672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061 (or 4057 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 1855239672 is about 43072.4932178299. The cubic root of 1855239672 is about 1228.7588935241.

The spelling of 1855239672 in words is "one billion, eight hundred fifty-five million, two hundred thirty-nine thousand, six hundred seventy-two".