897149790 has 128 divisors (see below), whose sum is σ = 2534976000. Its totient is φ = 225151488.

The previous prime is 897149777. The next prime is 897149819. The reversal of 897149790 is 97941798.

897149790 is a `hidden beast` number, since 89 + 71 + 497 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 917782 + ... + 918758.

It is an arithmetic number, because the mean of its divisors is an integer number (19804500).

Almost surely, 2^897149790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 897149790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1267488000).

897149790 is an abundant number, since it is smaller than the sum of its proper divisors (1637826210).

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

897149790 is a wasteful number, since it uses less digits than its factorization.

897149790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191 (or 1185 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 897149790 is about 29952.4588306202. The cubic root of 897149790 is about 964.4691040269.

The spelling of 897149790 in words is "eight hundred ninety-seven million, one hundred forty-nine thousand, seven hundred ninety".