3920581500 has 144 divisors (see below), whose sum is σ = 12549552288. Its totient is φ = 950400000.

The previous prime is 3920581477. The next prime is 3920581507. The reversal of 3920581500 is 51850293.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3920581507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170700 + ... + 192300.

Almost surely, 2^3920581500 is an apocalyptic number.

3920581500 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 3920581500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6274776144).

3920581500 is an abundant number, since it is smaller than the sum of its proper divisors (8628970788).

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

3920581500 is a wasteful number, since it uses less digits than its factorization.

3920581500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21645 (or 21622 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 3920581500 is about 62614.5470318200. The cubic root of 3920581500 is about 1576.8249946165.

The spelling of 3920581500 in words is "three billion, nine hundred twenty million, five hundred eighty-one thousand, five hundred".