1855289172 has 48 divisors (see below), whose sum is σ = 4750889472. Its totient is φ = 558835680.

The previous prime is 1855289171. The next prime is 1855289173. The reversal of 1855289172 is 2719825581.

It is an interprime number because it is at equal distance from previous prime (1855289171) and next prime (1855289173).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855289171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20038 + ... + 64125.

It is an arithmetic number, because the mean of its divisors is an integer number (98976864).

Almost surely, 2^1855289172 is an apocalyptic number.

1855289172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1855289172 is an abundant number, since it is smaller than the sum of its proper divisors (2895600300).

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

1855289172 is a wasteful number, since it uses less digits than its factorization.

1855289172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84348 (or 84346 counting only the distinct ones).

The product of its digits is 403200, while the sum is 48.

The square root of 1855289172 is about 43073.0678266594. The cubic root of 1855289172 is about 1228.7698216762.

Subtracting 1855289172 from its reverse (2719825581), we obtain a square (864536409 = 29403²).

The spelling of 1855289172 in words is "one billion, eight hundred fifty-five million, two hundred eighty-nine thousand, one hundred seventy-two".