397802521536 has 224 divisors, whose sum is σ = 1221625525248. Its totient is φ = 111891333120.

The previous prime is 397802521511. The next prime is 397802521573. The reversal of 397802521536 is 635125208793.

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

It is a super-2 number, since 2×397802521536² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73760056 + ... + 73765448.

Almost surely, 2^397802521536 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 397802521536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (610812762624).

397802521536 is an abundant number, since it is smaller than the sum of its proper divisors (823823003712).

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

397802521536 is a wasteful number, since it uses less digits than its factorization.

397802521536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259 (or 6249 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 397802521536 in words is "three hundred ninety-seven billion, eight hundred two million, five hundred twenty-one thousand, five hundred thirty-six".