3851821512 has 640 divisors, whose sum is σ = 15054336000. Its totient is φ = 888330240.

The previous prime is 3851821489. The next prime is 3851821553. The reversal of 3851821512 is 2151281583.

It is a super-2 number, since 2×3851821512² = 29673057920611932288, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 16116289 + ... + 16116527.

It is an arithmetic number, because the mean of its divisors is an integer number (23522400).

Almost surely, 2^3851821512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3851821512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7527168000).

3851821512 is an abundant number, since it is smaller than the sum of its proper divisors (11202514488).

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

3851821512 is a wasteful number, since it uses less digits than its factorization.

3851821512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 298 counting only the distinct ones).

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

The square root of 3851821512 is about 62063.0446562203. The cubic root of 3851821512 is about 1567.5523427497.

The spelling of 3851821512 in words is "three billion, eight hundred fifty-one million, eight hundred twenty-one thousand, five hundred twelve".