397442492286840 has 5376 divisors, whose sum is σ = 2003230779863040. Its totient is φ = 69415170048000.

The previous prime is 397442492286821. The next prime is 397442492286863. The reversal of 397442492286840 is 48682294244793.

397442492286840 is a `hidden beast` number, since 3 + 9 + 7 + 442 + 4 + 9 + 22 + 86 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 1343 ways as a sum of consecutive naturals, for example, 107678809395 + ... + 107678813085.

It is an arithmetic number, because the mean of its divisors is an integer number (372624773040).

Almost surely, 2^{397442492286840} is an apocalyptic number.

397442492286840 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 397442492286840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001615389931520).

397442492286840 is an abundant number, since it is smaller than the sum of its proper divisors (1605788287576200).

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

397442492286840 is a wasteful number, since it uses less digits than its factorization.

397442492286840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806 (or 3780 counting only the distinct ones).

The product of its (nonzero) digits is 1337720832, while the sum is 72.

The spelling of 397442492286840 in words is "three hundred ninety-seven trillion, four hundred forty-two billion, four hundred ninety-two million, two hundred eighty-six thousand, eight hundred forty".