394805109720 has 256 divisors, whose sum is σ = 1389357204480. Its totient is φ = 87867187200.

The previous prime is 394805109703. The next prime is 394805109737. The reversal of 394805109720 is 27901508493.

It is an interprime number because it is at equal distance from previous prime (394805109703) and next prime (394805109737).

It is a super-2 number, since 2×394805109720² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394805109720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17932239 + ... + 17954241.

It is an arithmetic number, because the mean of its divisors is an integer number (5427176580).

Almost surely, 2^394805109720 is an apocalyptic number.

394805109720 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 394805109720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694678602240).

394805109720 is an abundant number, since it is smaller than the sum of its proper divisors (994552094760).

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

394805109720 is a wasteful number, since it uses less digits than its factorization.

394805109720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22586 (or 22582 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 394805109720 in words is "three hundred ninety-four billion, eight hundred five million, one hundred nine thousand, seven hundred twenty".