981646 has 16 divisors (see below), whose sum is σ = 1548288. Its totient is φ = 466200.

The previous prime is 981637. The next prime is 981653. The reversal of 981646 is 646189.

981646 = T₂₃₆ + T₂₃₇ + ... + T₂₆₆.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4291 + ... + 4513.

It is an arithmetic number, because the mean of its divisors is an integer number (96768).

2⁹⁸¹⁶⁴⁶ is an apocalyptic number.

981646 is a deficient number, since it is larger than the sum of its proper divisors (566642).

981646 is a wasteful number, since it uses less digits than its factorization.

981646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327.

The product of its digits is 10368, while the sum is 34.

The square root of 981646 is about 990.7805004137. The cubic root of 981646 is about 99.3844183682.

The spelling of 981646 in words is "nine hundred eighty-one thousand, six hundred forty-six".