19612005 has 24 divisors (see below), whose sum is σ = 36503712. Its totient is φ = 8965152.

The previous prime is 19612001. The next prime is 19612007. The reversal of 19612005 is 50021691.

It is not a de Polignac number, because 19612005 - 2² = 19612001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19612001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12607 + ... + 14076.

It is an arithmetic number, because the mean of its divisors is an integer number (1520988).

Almost surely, 2^19612005 is an apocalyptic number.

19612005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19612005 is a deficient number, since it is larger than the sum of its proper divisors (16891707).

19612005 is a wasteful number, since it uses less digits than its factorization.

19612005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26705 (or 26698 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 19612005 is about 4428.5443432351. The cubic root of 19612005 is about 269.6749861490.

Adding to 19612005 its reverse (50021691), we get a palindrome (69633696).

The spelling of 19612005 in words is "nineteen million, six hundred twelve thousand, five".