9891242 has 12 divisors (see below), whose sum is σ = 15511650. Its totient is φ = 4730088.

The previous prime is 9891241. The next prime is 9891251. The reversal of 9891242 is 2421989.

It can be written as a sum of positive squares in only one way, i.e., 6754801 + 3136441 = 2599^2 + 1771^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9891241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3617 + ... + 5732.

Almost surely, 2^9891242 is an apocalyptic number.

9891242 is a deficient number, since it is larger than the sum of its proper divisors (5620408).

9891242 is a wasteful number, since it uses less digits than its factorization.

9891242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9397 (or 9374 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 9891242 is about 3145.0344990159. The cubic root of 9891242 is about 214.6595802649.

The spelling of 9891242 in words is "nine million, eight hundred ninety-one thousand, two hundred forty-two".