890645 has 8 divisors (see below), whose sum is σ = 1221504. Its totient is φ = 610704.

The previous prime is 890609. The next prime is 890653. The reversal of 890645 is 546098.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 890645 - 2¹² = 886549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12689 + ... + 12758.

It is an arithmetic number, because the mean of its divisors is an integer number (152688).

2⁸⁹⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

890645 is a deficient number, since it is larger than the sum of its proper divisors (330859).

890645 is a wasteful number, since it uses less digits than its factorization.

890645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25459.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 890645 is about 943.7399006082. The cubic root of 890645 is about 96.2132484639.

The spelling of 890645 in words is "eight hundred ninety thousand, six hundred forty-five".