397794859840 has 224 divisors, whose sum is σ = 1108362528000. Its totient is φ = 133168742400.

The previous prime is 397794859807. The next prime is 397794859841. The reversal of 397794859840 is 48958497793.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397794859841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19681740 + ... + 19701940.

It is an arithmetic number, because the mean of its divisors is an integer number (4948047000).

Almost surely, 2^397794859840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397794859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554181264000).

397794859840 is an abundant number, since it is smaller than the sum of its proper divisors (710567668160).

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

397794859840 is a wasteful number, since it uses less digits than its factorization.

397794859840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20433 (or 20423 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 73.

The spelling of 397794859840 in words is "three hundred ninety-seven billion, seven hundred ninety-four million, eight hundred fifty-nine thousand, eight hundred forty".