1855188040 has 16 divisors (see below), whose sum is σ = 4174173180. Its totient is φ = 742075200.

The previous prime is 1855188031. The next prime is 1855188077. The reversal of 1855188040 is 408815581.

It can be written as a sum of positive squares in 2 ways, for example, as 1850548324 + 4639716 = 43018^2 + 2154^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 46379701 = 1855188040 / (1 + 8 + 5 + 5 + 1 + 8 + 8 + 0 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1855187984 and 1855188002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23189811 + ... + 23189890.

Almost surely, 2^1855188040 is an apocalyptic number.

1855188040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1855188040 is an abundant number, since it is smaller than the sum of its proper divisors (2318985140).

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

1855188040 is a wasteful number, since it uses less digits than its factorization.

1855188040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46379712 (or 46379708 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 40.

The square root of 1855188040 is about 43071.8938520237. The cubic root of 1855188040 is about 1228.7474944815.

The spelling of 1855188040 in words is "one billion, eight hundred fifty-five million, one hundred eighty-eight thousand, forty".