395981739840 has 224 divisors, whose sum is σ = 1333039386240. Its totient is φ = 99246145536.

The previous prime is 395981739827. The next prime is 395981739871. The reversal of 395981739840 is 48937189593.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 12044064 + ... + 12076896.

Almost surely, 2^395981739840 is an apocalyptic number.

395981739840 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 395981739840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666519693120).

395981739840 is an abundant number, since it is smaller than the sum of its proper divisors (937057646400).

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

395981739840 is a wasteful number, since it uses less digits than its factorization.

395981739840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33609 (or 33599 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 66.

The spelling of 395981739840 in words is "three hundred ninety-five billion, nine hundred eighty-one million, seven hundred thirty-nine thousand, eight hundred forty".