3921081000 has 128 divisors (see below), whose sum is σ = 12441686400. Its totient is φ = 1027852800.

The previous prime is 3921080993. The next prime is 3921081041. The reversal of 3921081000 is 1801293.

It is a super-2 number, since 2×3921081000² = 30749752417122000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165924 + ... + 188076.

It is an arithmetic number, because the mean of its divisors is an integer number (97200675).

Almost surely, 2^3921081000 is an apocalyptic number.

3921081000 is a gapful number since it is divisible by the number (30) 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 3921081000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6220843200).

3921081000 is an abundant number, since it is smaller than the sum of its proper divisors (8520605400).

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

3921081000 is a wasteful number, since it uses less digits than its factorization.

3921081000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22236 (or 22222 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3921081000 is about 62618.5355945027. The cubic root of 3921081000 is about 1576.8919566762.

Adding to 3921081000 its reverse (1801293), we get a palindrome (3922882293).

The spelling of 3921081000 in words is "three billion, nine hundred twenty-one million, eighty-one thousand".