1968281 has 6 divisors (see below), whose sum is σ = 2289690. Its totient is φ = 1687056.

The previous prime is 1968269. The next prime is 1968293. The reversal of 1968281 is 1828691.

It is an interprime number because it is at equal distance from previous prime (1968269) and next prime (1968293).

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 8281 = 1400^2 + 91^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1968281 is a prime.

It is a super-2 number, since 2×1968281² = 7748260189922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20036 + ... + 20133.

It is an arithmetic number, because the mean of its divisors is an integer number (381615).

2^1968281 is an apocalyptic number.

It is an amenable number.

1968281 is a deficient number, since it is larger than the sum of its proper divisors (321409).

1968281 is an equidigital number, since it uses as much as digits as its factorization.

1968281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40183 (or 40176 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 1968281 is about 1402.9543827224. The cubic root of 1968281 is about 125.3224952589.

It can be divided in two parts, 196 and 8281, that multiplied together give a square (1623076 = 1274²).

The spelling of 1968281 in words is "one million, nine hundred sixty-eight thousand, two hundred eighty-one".