981945 has 12 divisors (see below), whose sum is σ = 1702116. Its totient is φ = 523680.

The previous prime is 981941. The next prime is 981947. The reversal of 981945 is 549189.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 514089 = 684^2 + 717^2 .

It is not a de Polignac number, because 981945 - 2² = 981941 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10866 + ... + 10955.

It is an arithmetic number, because the mean of its divisors is an integer number (141843).

2⁹⁸¹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

981945 is a deficient number, since it is larger than the sum of its proper divisors (720171).

981945 is a wasteful number, since it uses less digits than its factorization.

981945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21832 (or 21829 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 981945 is about 990.9313800662. The cubic root of 981945 is about 99.3945078589.

It can be divided in two parts, 9 and 81945, that multiplied together give a triangular number (737505 = T₁₂₁₄).

The spelling of 981945 in words is "nine hundred eighty-one thousand, nine hundred forty-five".