19281997 has 8 divisors (see below), whose sum is σ = 22366016. Its totient is φ = 16280352.

The previous prime is 19281989. The next prime is 19282007. The reversal of 19281997 is 79918291.

It is a happy number.

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 19281997 - 2³ = 19281989 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 (19281937) 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, 20088 + ... + 21025.

It is an arithmetic number, because the mean of its divisors is an integer number (2795752).

Almost surely, 2^19281997 is an apocalyptic number.

It is an amenable number.

19281997 is a deficient number, since it is larger than the sum of its proper divisors (3084019).

19281997 is an equidigital number, since it uses as much as digits as its factorization.

19281997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41187.

The product of its digits is 81648, while the sum is 46.

The square root of 19281997 is about 4391.1270762755. The cubic root of 19281997 is about 268.1538295967.

The spelling of 19281997 in words is "nineteen million, two hundred eighty-one thousand, nine hundred ninety-seven".