898639 has 4 divisors (see below), whose sum is σ = 1027024. Its totient is φ = 770256.

The previous prime is 898621. The next prime is 898661. The reversal of 898639 is 936898.

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 898639 - 2⁵ = 898607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 898595 and 898604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (898669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64182 + ... + 64195.

It is an arithmetic number, because the mean of its divisors is an integer number (256756).

2⁸⁹⁸⁶³⁹ is an apocalyptic number.

898639 is a deficient number, since it is larger than the sum of its proper divisors (128385).

898639 is a wasteful number, since it uses less digits than its factorization.

898639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128384.

The product of its digits is 93312, while the sum is 43.

The square root of 898639 is about 947.9657166797. The cubic root of 898639 is about 96.5002460910.

It can be divided in two parts, 8986 and 39, that added together give a square (9025 = 95²).

The spelling of 898639 in words is "eight hundred ninety-eight thousand, six hundred thirty-nine".