646898 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 258720.

The previous prime is 646897. The next prime is 646909. The reversal of 646898 is 898646.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Curzon number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646897) 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 15 ways as a sum of consecutive naturals, for example, 15758 + ... + 15798.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶⁴⁶⁸⁹⁸ is an apocalyptic number.

646898 is a deficient number, since it is larger than the sum of its proper divisors (562702).

646898 is a wasteful number, since it uses less digits than its factorization.

646898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 73 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 646898 is about 804.2996953872. The cubic root of 646898 is about 86.4858920937.

The spelling of 646898 in words is "six hundred forty-six thousand, eight hundred ninety-eight".