897399189540 has 768 divisors, whose sum is σ = 3485755607040. Its totient is φ = 189353189376.

The previous prime is 897399189539. The next prime is 897399189553. The reversal of 897399189540 is 45981993798.

897399189540 is a `hidden beast` number, since 8 + 9 + 7 + 399 + 189 + 54 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 275866554 + ... + 275869806.

It is an arithmetic number, because the mean of its divisors is an integer number (4538744280).

Almost surely, 2^897399189540 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 897399189540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742877803520).

897399189540 is an abundant number, since it is smaller than the sum of its proper divisors (2588356417500).

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

897399189540 is a wasteful number, since it uses less digits than its factorization.

897399189540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 72.

The spelling of 897399189540 in words is "eight hundred ninety-seven billion, three hundred ninety-nine million, one hundred eighty-nine thousand, five hundred forty".