1985281 has 3 divisors (see below), whose sum is σ = 1986691. Its totient is φ = 1983872.

The previous prime is 1985279. The next prime is 1985287. The reversal of 1985281 is 1825891.

The square root of 1985281 is 1409.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 25281 + 1960000 = 159^2 + 1400^2 .

It is not a de Polignac number, because 1985281 - 2¹ = 1985279 is a prime.

It is a super-4 number, since 4×1985281⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985287) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 705 + ... + 2113.

2^1985281 is an apocalyptic number.

1985281 is the 1409-th square number.

1985281 is the 705-th centered octagonal number.

It is an amenable number.

1985281 is a deficient number, since it is larger than the sum of its proper divisors (1410).

1985281 is an frugal number, since it uses more digits than its factorization.

1985281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818 (or 1409 counting only the distinct ones).

The product of its digits is 5760, while the sum is 34.

The cubic root of 1985281 is about 125.6822640180.

The spelling of 1985281 in words is "one million, nine hundred eighty-five thousand, two hundred eighty-one".