19971008 has 14 divisors (see below), whose sum is σ = 39630096. Its totient is φ = 9985472.

The previous prime is 19970999. The next prime is 19971013. The reversal of 19971008 is 80017991.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 155960 + ... + 156087.

Almost surely, 2^19971008 is an apocalyptic number.

It is an amenable number.

19971008 is a deficient number, since it is larger than the sum of its proper divisors (19659088).

19971008 is an equidigital number, since it uses as much as digits as its factorization.

19971008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312059 (or 312049 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 19971008 is about 4468.8933753224. The cubic root of 19971008 is about 271.3105375723.

Adding to 19971008 its reverse (80017991), we get a palindrome (99988999).

The spelling of 19971008 in words is "nineteen million, nine hundred seventy-one thousand, eight".