397982847780 has 288 divisors, whose sum is σ = 1447535351808. Its totient is φ = 86589388800.

The previous prime is 397982847761. The next prime is 397982847803. The reversal of 397982847780 is 87748289793.

397982847780 is a `hidden beast` number, since 3 + 9 + 79 + 8 + 2 + 8 + 477 + 80 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 397982847699 and 397982847708.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2299144 + ... + 2466176.

It is an arithmetic number, because the mean of its divisors is an integer number (5026164416).

Almost surely, 2^397982847780 is an apocalyptic number.

397982847780 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 397982847780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723767675904).

397982847780 is an abundant number, since it is smaller than the sum of its proper divisors (1049552504028).

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

397982847780 is a wasteful number, since it uses less digits than its factorization.

397982847780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167147 (or 167142 counting only the distinct ones).

The product of its (nonzero) digits is 341397504, while the sum is 72.

The spelling of 397982847780 in words is "three hundred ninety-seven billion, nine hundred eighty-two million, eight hundred forty-seven thousand, seven hundred eighty".