9438991 has 4 divisors (see below), whose sum is σ = 9935800. Its totient is φ = 8942184.

The previous prime is 9438983. The next prime is 9439019. The reversal of 9438991 is 1998349.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9438991 - 2³ = 9438983 is a prime.

It is a Duffinian number.

9438991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9438931) 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, 248376 + ... + 248413.

It is an arithmetic number, because the mean of its divisors is an integer number (2483950).

Almost surely, 2^9438991 is an apocalyptic number.

9438991 is a deficient number, since it is larger than the sum of its proper divisors (496809).

9438991 is a wasteful number, since it uses less digits than its factorization.

9438991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496808.

The product of its digits is 69984, while the sum is 43.

The square root of 9438991 is about 3072.2940939956. The cubic root of 9438991 is about 211.3368308943.

The spelling of 9438991 in words is "nine million, four hundred thirty-eight thousand, nine hundred ninety-one".