19997275 has 6 divisors (see below), whose sum is σ = 24796652. Its totient is φ = 15997800.

The previous prime is 19997267. The next prime is 19997297. The reversal of 19997275 is 57279991.

It is not a de Polignac number, because 19997275 - 2³ = 19997267 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 399921 + ... + 399970.

Almost surely, 2^19997275 is an apocalyptic number.

19997275 is a deficient number, since it is larger than the sum of its proper divisors (4799377).

19997275 is an equidigital number, since it uses as much as digits as its factorization.

19997275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799901 (or 799896 counting only the distinct ones).

The product of its digits is 357210, while the sum is 49.

The square root of 19997275 is about 4471.8312803593. The cubic root of 19997275 is about 271.4294331195.

The spelling of 19997275 in words is "nineteen million, nine hundred ninety-seven thousand, two hundred seventy-five".