897139 has 4 divisors (see below), whose sum is σ = 921424. Its totient is φ = 872856.

The previous prime is 897137. The next prime is 897157. The reversal of 897139 is 931798.

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 897139 - 2¹ = 897137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 24247 = 897139 / (8 + 9 + 7 + 1 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 897098 and 897107.

It is not an unprimeable number, because it can be changed into a prime (897133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12087 + ... + 12160.

It is an arithmetic number, because the mean of its divisors is an integer number (230356).

2⁸⁹⁷¹³⁹ is an apocalyptic number.

897139 is a deficient number, since it is larger than the sum of its proper divisors (24285).

897139 is a wasteful number, since it uses less digits than its factorization.

897139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24284.

The product of its digits is 13608, while the sum is 37.

The square root of 897139 is about 947.1742183991. The cubic root of 897139 is about 96.4465237462.

The spelling of 897139 in words is "eight hundred ninety-seven thousand, one hundred thirty-nine".