1851485240 has 64 divisors (see below), whose sum is σ = 4568555520. Its totient is φ = 669712000.

The previous prime is 1851485239. The next prime is 1851485243. The reversal of 1851485240 is 425841581.

It is a junction number, because it is equal to n+sod(n) for n = 1851485194 and 1851485203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851485243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73025 + ... + 95055.

It is an arithmetic number, because the mean of its divisors is an integer number (71383680).

Almost surely, 2^1851485240 is an apocalyptic number.

1851485240 is a gapful number since it is divisible by the number (10) 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 1851485240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284277760).

1851485240 is an abundant number, since it is smaller than the sum of its proper divisors (2717070280).

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

1851485240 is a wasteful number, since it uses less digits than its factorization.

1851485240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22244 (or 22240 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 38.

The square root of 1851485240 is about 43028.8884355615. Note that the first 3 decimals coincide. The cubic root of 1851485240 is about 1227.9294576220.

The spelling of 1851485240 in words is "one billion, eight hundred fifty-one million, four hundred eighty-five thousand, two hundred forty".