1850821245 has 120 divisors (see below), whose sum is σ = 4106906496. Its totient is φ = 780803712.

The previous prime is 1850821213. The next prime is 1850821249. The reversal of 1850821245 is 5421280581.

It is not a de Polignac number, because 1850821245 - 2⁵ = 1850821213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1850821249) 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 119 ways as a sum of consecutive naturals, for example, 477184 + ... + 481046.

Almost surely, 2^1850821245 is an apocalyptic number.

1850821245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1850821245 is an abundant number, since it is smaller than the sum of its proper divisors (2256085251).

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

1850821245 is a wasteful number, since it uses less digits than its factorization.

1850821245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913 (or 3891 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 1850821245 is about 43021.1720551637. The cubic root of 1850821245 is about 1227.7826499871.

The spelling of 1850821245 in words is "one billion, eight hundred fifty million, eight hundred twenty-one thousand, two hundred forty-five".