981385 has 4 divisors (see below), whose sum is σ = 1177668. Its totient is φ = 785104.

The previous prime is 981377. The next prime is 981391. The reversal of 981385 is 583189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 606841 + 374544 = 779^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 981385 - 2³ = 981377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981385.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98134 + ... + 98143.

It is an arithmetic number, because the mean of its divisors is an integer number (294417).

2⁹⁸¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

981385 is a deficient number, since it is larger than the sum of its proper divisors (196283).

981385 is a wasteful number, since it uses less digits than its factorization.

981385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196282.

The product of its digits is 8640, while the sum is 34.

The square root of 981385 is about 990.6487773172. The cubic root of 981385 is about 99.3756094790.

Adding to 981385 its product of digits (8640), we get a square (990025 = 995²).

The spelling of 981385 in words is "nine hundred eighty-one thousand, three hundred eighty-five".