19797999 has 8 divisors (see below), whose sum is σ = 28427952. Its totient is φ = 12183360.

The previous prime is 19797989. The next prime is 19798001. The reversal of 19797999 is 99979791.

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

It is not a de Polignac number, because 19797999 - 2⁴ = 19797983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19797929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253782 + ... + 253859.

It is an arithmetic number, because the mean of its divisors is an integer number (3553494).

Almost surely, 2^19797999 is an apocalyptic number.

19797999 is a deficient number, since it is larger than the sum of its proper divisors (8629953).

19797999 is a wasteful number, since it uses less digits than its factorization.

19797999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507657.

The product of its digits is 2893401, while the sum is 60.

The square root of 19797999 is about 4449.4942409222. The cubic root of 19797999 is about 270.5248091518.

The spelling of 19797999 in words is "nineteen million, seven hundred ninety-seven thousand, nine hundred ninety-nine".