1968485821 has 4 divisors (see below), whose sum is σ = 1976934492. Its totient is φ = 1960037152.

The previous prime is 1968485801. The next prime is 1968485837. The reversal of 1968485821 is 1285848691.

It is a happy number.

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 567106596 + 1401379225 = 23814^2 + 37435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968485821 - 2¹³ = 1968477629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968485801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4223986 + ... + 4224451.

It is an arithmetic number, because the mean of its divisors is an integer number (494233623).

Almost surely, 2^1968485821 is an apocalyptic number.

It is an amenable number.

1968485821 is a deficient number, since it is larger than the sum of its proper divisors (8448671).

1968485821 is an equidigital number, since it uses as much as digits as its factorization.

1968485821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448670.

The product of its digits is 1105920, while the sum is 52.

The square root of 1968485821 is about 44367.6213132956. The cubic root of 1968485821 is about 1253.2684216341.

The spelling of 1968485821 in words is "one billion, nine hundred sixty-eight million, four hundred eighty-five thousand, eight hundred twenty-one".