19219797 has 6 divisors (see below), whose sum is σ = 27761942. Its totient is φ = 12813192.

The previous prime is 19219787. The next prime is 19219801. The reversal of 19219797 is 79791291.

It can be written as a sum of positive squares in only one way, i.e., 18714276 + 505521 = 4326^2 + 711^2 .

It is not a de Polignac number, because 19219797 - 2¹⁵ = 19187029 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 (19219747) 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 5 ways as a sum of consecutive naturals, for example, 1067758 + ... + 1067775.

Almost surely, 2^19219797 is an apocalyptic number.

It is an amenable number.

19219797 is a deficient number, since it is larger than the sum of its proper divisors (8542145).

19219797 is a wasteful number, since it uses less digits than its factorization.

19219797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135539 (or 2135536 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 19219797 is about 4384.0388912509. The cubic root of 19219797 is about 267.8651815035.

The spelling of 19219797 in words is "nineteen million, two hundred nineteen thousand, seven hundred ninety-seven".