19932349640 has 32 divisors (see below), whose sum is σ = 51254614080. Its totient is φ = 6833948352.

The previous prime is 19932349609. The next prime is 19932349643. The reversal of 19932349640 is 4694323991.

It is not an unprimeable number, because it can be changed into a prime (19932349643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35593202 + ... + 35593761.

It is an arithmetic number, because the mean of its divisors is an integer number (1601706690).

Almost surely, 2^19932349640 is an apocalyptic number.

19932349640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19932349640 is an abundant number, since it is smaller than the sum of its proper divisors (31322264440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19932349640 is a wasteful number, since it uses less digits than its factorization.

19932349640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71186981 (or 71186977 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 19932349640 in words is "nineteen billion, nine hundred thirty-two million, three hundred forty-nine thousand, six hundred forty".