897138647 has 4 divisors (see below), whose sum is σ = 900861456. Its totient is φ = 893415840.

The previous prime is 897138631. The next prime is 897138653. The reversal of 897138647 is 746831798.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 897138647 - 2⁴ = 897138631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897138607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861043 + ... + 1861524.

It is an arithmetic number, because the mean of its divisors is an integer number (225215364).

Almost surely, 2^897138647 is an apocalyptic number.

897138647 is a deficient number, since it is larger than the sum of its proper divisors (3722809).

897138647 is a wasteful number, since it uses less digits than its factorization.

897138647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722808.

The product of its digits is 2032128, while the sum is 53.

The square root of 897138647 is about 29952.2728186026. The cubic root of 897138647 is about 964.4651109651.

The spelling of 897138647 in words is "eight hundred ninety-seven million, one hundred thirty-eight thousand, six hundred forty-seven".