9945219 has 4 divisors (see below), whose sum is σ = 13260296. Its totient is φ = 6630144.

The previous prime is 9945211. The next prime is 9945233. The reversal of 9945219 is 9125499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9125499 = 3 ⋅3041833.

It is not a de Polignac number, because 9945219 - 2³ = 9945211 is a prime.

It is a super-2 number, since 2×9945219² = 197814761915922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9945211) 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, 1657534 + ... + 1657539.

It is an arithmetic number, because the mean of its divisors is an integer number (3315074).

Almost surely, 2^9945219 is an apocalyptic number.

9945219 is a deficient number, since it is larger than the sum of its proper divisors (3315077).

9945219 is a wasteful number, since it uses less digits than its factorization.

9945219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315076.

The product of its digits is 29160, while the sum is 39.

The square root of 9945219 is about 3153.6041286122. The cubic root of 9945219 is about 215.0493414788.

The spelling of 9945219 in words is "nine million, nine hundred forty-five thousand, two hundred nineteen".