897639 has 4 divisors (see below), whose sum is σ = 1196856. Its totient is φ = 598424.

The previous prime is 897629. The next prime is 897647. The reversal of 897639 is 936798.

It is a happy number.

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 897639 - 2⁵ = 897607 is a prime.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 897639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897629) 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, 149604 + ... + 149609.

It is an arithmetic number, because the mean of its divisors is an integer number (299214).

2⁸⁹⁷⁶³⁹ is an apocalyptic number.

897639 is a deficient number, since it is larger than the sum of its proper divisors (299217).

897639 is a wasteful number, since it uses less digits than its factorization.

897639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299216.

The product of its digits is 81648, while the sum is 42.

The square root of 897639 is about 947.4381246287. The cubic root of 897639 is about 96.4644378435.

The spelling of 897639 in words is "eight hundred ninety-seven thousand, six hundred thirty-nine".