19864097 has 4 divisors (see below), whose sum is σ = 21669936. Its totient is φ = 18058260.

The previous prime is 19864081. The next prime is 19864099. The reversal of 19864097 is 79046891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19864097 - 2⁴ = 19864081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19864099) 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 3 ways as a sum of consecutive naturals, for example, 902903 + ... + 902924.

It is an arithmetic number, because the mean of its divisors is an integer number (5417484).

Almost surely, 2^19864097 is an apocalyptic number.

It is an amenable number.

19864097 is a deficient number, since it is larger than the sum of its proper divisors (1805839).

19864097 is a wasteful number, since it uses less digits than its factorization.

19864097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805838.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 19864097 is about 4456.9156375233. The cubic root of 19864097 is about 270.8255345973.

The spelling of 19864097 in words is "nineteen million, eight hundred sixty-four thousand, ninety-seven".