19233640638 has 12 divisors (see below), whose sum is σ = 41672888088. Its totient is φ = 6411213540.

The previous prime is 19233640633. The next prime is 19233640639. The reversal of 19233640638 is 83604633291.

19233640638 is a `hidden beast` number, since 1 + 9 + 2 + 3 + 3 + 6 + 4 + 0 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19233640593 and 19233640602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19233640633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 534267778 + ... + 534267813.

It is an arithmetic number, because the mean of its divisors is an integer number (3472740674).

Almost surely, 2^19233640638 is an apocalyptic number.

19233640638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19233640638 is an abundant number, since it is smaller than the sum of its proper divisors (22439247450).

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

19233640638 is a wasteful number, since it uses less digits than its factorization.

19233640638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068535599 (or 1068535596 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 19233640638 in words is "nineteen billion, two hundred thirty-three million, six hundred forty thousand, six hundred thirty-eight".