19971005 has 16 divisors (see below), whose sum is σ = 25920000. Its totient is φ = 14714112.

The previous prime is 19970999. The next prime is 19971013. The reversal of 19971005 is 50017991.

It is not a de Polignac number, because 19971005 - 2⁶ = 19970941 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1496 + ... + 6494.

It is an arithmetic number, because the mean of its divisors is an integer number (1620000).

Almost surely, 2^19971005 is an apocalyptic number.

It is an amenable number.

19971005 is a deficient number, since it is larger than the sum of its proper divisors (5948995).

19971005 is a wasteful number, since it uses less digits than its factorization.

19971005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 19971005 is about 4468.8930396688. The cubic root of 19971005 is about 271.3105239871.

Adding to 19971005 its reverse (50017991), we get a palindrome (69988996).

The spelling of 19971005 in words is "nineteen million, nine hundred seventy-one thousand, five".