38391239520 has 168 divisors, whose sum is σ = 135987160176. Its totient is φ = 10237632768.

The previous prime is 38391239483. The next prime is 38391239527. The reversal of 38391239520 is 2593219383.

38391239520 is a `hidden beast` number, since 3 + 8 + 3 + 91 + 2 + 39 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38391239527) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 47932 + ... + 281211.

It is an arithmetic number, because the mean of its divisors is an integer number (809447382).

Almost surely, 2^38391239520 is an apocalyptic number.

38391239520 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 38391239520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67993580088).

38391239520 is an abundant number, since it is smaller than the sum of its proper divisors (97595920656).

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

38391239520 is an equidigital number, since it uses as much as digits as its factorization.

38391239520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329176 (or 329153 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 38391239520 in words is "thirty-eight billion, three hundred ninety-one million, two hundred thirty-nine thousand, five hundred twenty".