9742221 has 8 divisors (see below), whose sum is σ = 14432960. Its totient is φ = 6494796.

The previous prime is 9742219. The next prime is 9742253. The reversal of 9742221 is 1222479.

9742221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9742221 - 2¹ = 9742219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 360823 = 9742221 / (9 + 7 + 4 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9742121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180385 + ... + 180438.

It is an arithmetic number, because the mean of its divisors is an integer number (1804120).

Almost surely, 2^9742221 is an apocalyptic number.

It is an amenable number.

9742221 is a deficient number, since it is larger than the sum of its proper divisors (4690739).

9742221 is a wasteful number, since it uses less digits than its factorization.

9742221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360832 (or 360826 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 9742221 is about 3121.2531137349. The cubic root of 9742221 is about 213.5761035633.

The spelling of 9742221 in words is "nine million, seven hundred forty-two thousand, two hundred twenty-one".