1968187285 has 4 divisors (see below), whose sum is σ = 2361824748. Its totient is φ = 1574549824.

The previous prime is 1968187267. The next prime is 1968187289. The reversal of 1968187285 is 5827818691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5827818691 = 75401 ⋅77291.

It can be written as a sum of positive squares in 2 ways, for example, as 326235844 + 1641951441 = 18062^2 + 40521^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968187285 - 2⁷ = 1968187157 is a prime.

It is a super-2 number, since 2×1968187285² = 7747522377671342450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968187289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196818724 + ... + 196818733.

It is an arithmetic number, because the mean of its divisors is an integer number (590456187).

Almost surely, 2^1968187285 is an apocalyptic number.

It is an amenable number.

1968187285 is a deficient number, since it is larger than the sum of its proper divisors (393637463).

1968187285 is an equidigital number, since it uses as much as digits as its factorization.

1968187285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393637462.

The product of its digits is 1935360, while the sum is 55.

The square root of 1968187285 is about 44364.2568403890. The cubic root of 1968187285 is about 1253.2050625024.

The spelling of 1968187285 in words is "one billion, nine hundred sixty-eight million, one hundred eighty-seven thousand, two hundred eighty-five".