1851821532 has 36 divisors (see below), whose sum is σ = 5106539256. Its totient is φ = 561157920.

The previous prime is 1851821527. The next prime is 1851821533. The reversal of 1851821532 is 2351281581.

1851821532 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851821533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2337763 + ... + 2338554.

Almost surely, 2^1851821532 is an apocalyptic number.

1851821532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1851821532 is an abundant number, since it is smaller than the sum of its proper divisors (3254717724).

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

1851821532 is a wasteful number, since it uses less digits than its factorization.

1851821532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676338 (or 4676333 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 1851821532 is about 43032.7960049077. The cubic root of 1851821532 is about 1228.0037975529.

The spelling of 1851821532 in words is "one billion, eight hundred fifty-one million, eight hundred twenty-one thousand, five hundred thirty-two".