19897716 has 24 divisors (see below), whose sum is σ = 46710720. Its totient is φ = 6592192.

The previous prime is 19897699. The next prime is 19897729. The reversal of 19897716 is 61779891.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2961 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (1946280).

Almost surely, 2^19897716 is an apocalyptic number.

It is an amenable number.

19897716 is an abundant number, since it is smaller than the sum of its proper divisors (26813004).

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

19897716 is a wasteful number, since it uses less digits than its factorization.

19897716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10103 (or 10101 counting only the distinct ones).

The product of its digits is 190512, while the sum is 48.

The square root of 19897716 is about 4460.6855975287. The cubic root of 19897716 is about 270.9782347502.

The spelling of 19897716 in words is "nineteen million, eight hundred ninety-seven thousand, seven hundred sixteen".