19940097 has 4 divisors (see below), whose sum is σ = 26586800. Its totient is φ = 13293396.

The previous prime is 19940059. The next prime is 19940113. The reversal of 19940097 is 79004991.

19940097 = 1044² + 1045² + ... + 1061².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19940097 - 2⁶ = 19940033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19940017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3323347 + ... + 3323352.

It is an arithmetic number, because the mean of its divisors is an integer number (6646700).

Almost surely, 2^19940097 is an apocalyptic number.

It is an amenable number.

19940097 is a deficient number, since it is larger than the sum of its proper divisors (6646703).

19940097 is an equidigital number, since it uses as much as digits as its factorization.

19940097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6646702.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 19940097 is about 4465.4335735738. The cubic root of 19940097 is about 271.1704877128.

The spelling of 19940097 in words is "nineteen million, nine hundred forty thousand, ninety-seven".