9919397 has 4 divisors (see below), whose sum is σ = 10130496. Its totient is φ = 9708300.

The previous prime is 9919391. The next prime is 9919409. The reversal of 9919397 is 7939199.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 9919397 - 2¹⁰ = 9918373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 211051 = 9919397 / (9 + 9 + 1 + 9 + 3 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9919391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105479 + ... + 105572.

It is an arithmetic number, because the mean of its divisors is an integer number (2532624).

Almost surely, 2^9919397 is an apocalyptic number.

It is an amenable number.

9919397 is a deficient number, since it is larger than the sum of its proper divisors (211099).

9919397 is a wasteful number, since it uses less digits than its factorization.

9919397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211098.

The product of its digits is 137781, while the sum is 47.

The square root of 9919397 is about 3149.5074218042. The cubic root of 9919397 is about 214.8630604452.

The spelling of 9919397 in words is "nine million, nine hundred nineteen thousand, three hundred ninety-seven".