19992797 has 8 divisors (see below), whose sum is σ = 21866112. Its totient is φ = 18128800.

The previous prime is 19992793. The next prime is 19992809. The reversal of 19992797 is 79729991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19992797 - 2² = 19992793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19992793) 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 7 ways as a sum of consecutive naturals, for example, 2633 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (2733264).

Almost surely, 2^19992797 is an apocalyptic number.

It is an amenable number.

19992797 is a deficient number, since it is larger than the sum of its proper divisors (1873315).

19992797 is a wasteful number, since it uses less digits than its factorization.

19992797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659.

The product of its digits is 642978, while the sum is 53.

The square root of 19992797 is about 4471.3305625954. The cubic root of 19992797 is about 271.4091711632.

The spelling of 19992797 in words is "nineteen million, nine hundred ninety-two thousand, seven hundred ninety-seven".