1968951639 has 32 divisors (see below), whose sum is σ = 2893676544. Its totient is φ = 1186748640.

The previous prime is 1968951631. The next prime is 1968951653. The reversal of 1968951639 is 9361598691.

It is not a de Polignac number, because 1968951639 - 2³ = 1968951631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968951631) 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 31 ways as a sum of consecutive naturals, for example, 81274 + ... + 102680.

It is an arithmetic number, because the mean of its divisors is an integer number (90427392).

Almost surely, 2^1968951639 is an apocalyptic number.

1968951639 is a deficient number, since it is larger than the sum of its proper divisors (924724905).

1968951639 is a wasteful number, since it uses less digits than its factorization.

1968951639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21507.

The product of its digits is 3149280, while the sum is 57.

The square root of 1968951639 is about 44372.8705291871. The cubic root of 1968951639 is about 1253.3672706987.

The spelling of 1968951639 in words is "one billion, nine hundred sixty-eight million, nine hundred fifty-one thousand, six hundred thirty-nine".