397789812500 has 42 divisors (see below), whose sum is σ = 870154213446. Its totient is φ = 159115900000.

The previous prime is 397789812439. The next prime is 397789812517. The reversal of 397789812500 is 5218987793.

It can be written as a sum of positive squares in 7 ways, for example, as 394178042896 + 3611769604 = 627836^2 + 60098^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 397789812500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3119819 + ... + 3244818.

It is an arithmetic number, because the mean of its divisors is an integer number (20717957463).

Almost surely, 2^397789812500 is an apocalyptic number.

It is an amenable number.

397789812500 is an abundant number, since it is smaller than the sum of its proper divisors (472364400946).

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

397789812500 is an frugal number, since it uses more digits than its factorization.

397789812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364671 (or 6364644 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 397789812500 in words is "three hundred ninety-seven billion, seven hundred eighty-nine million, eight hundred twelve thousand, five hundred".