1968492409 has 4 divisors (see below), whose sum is σ = 2119914916. Its totient is φ = 1817069904.

The previous prime is 1968492371. The next prime is 1968492419. The reversal of 1968492409 is 9042948691.

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 599270400 + 1369222009 = 24480^2 + 37003^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1968492409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968492419) 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, 75711234 + ... + 75711259.

It is an arithmetic number, because the mean of its divisors is an integer number (529978729).

Almost surely, 2^1968492409 is an apocalyptic number.

It is an amenable number.

1968492409 is a deficient number, since it is larger than the sum of its proper divisors (151422507).

1968492409 is a wasteful number, since it uses less digits than its factorization.

1968492409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151422506.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1968492409 is about 44367.6955565646. The cubic root of 1968492409 is about 1253.2698197516.

The spelling of 1968492409 in words is "one billion, nine hundred sixty-eight million, four hundred ninety-two thousand, four hundred nine".