19897086 has 16 divisors (see below), whose sum is σ = 43411968. Its totient is φ = 6029400.

The previous prime is 19897079. The next prime is 19897109. The reversal of 19897086 is 68079891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 150670 + ... + 150801.

It is an arithmetic number, because the mean of its divisors is an integer number (2713248).

Almost surely, 2^19897086 is an apocalyptic number.

19897086 is an abundant number, since it is smaller than the sum of its proper divisors (23514882).

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

19897086 is a wasteful number, since it uses less digits than its factorization.

19897086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301487.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 19897086 is about 4460.6149800224. The cubic root of 19897086 is about 270.9753748225.

The spelling of 19897086 in words is "nineteen million, eight hundred ninety-seven thousand, eighty-six".