991442 has 8 divisors (see below), whose sum is σ = 1535232. Its totient is φ = 479700.

The previous prime is 991429. The next prime is 991447. The reversal of 991442 is 244199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (991447) by changing a digit.

991442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7934 + ... + 8057.

It is an arithmetic number, because the mean of its divisors is an integer number (191904).

2⁹⁹¹⁴⁴² is an apocalyptic number.

991442 is a deficient number, since it is larger than the sum of its proper divisors (543790).

991442 is a wasteful number, since it uses less digits than its factorization.

991442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16024.

The product of its digits is 2592, while the sum is 29.

The square root of 991442 is about 995.7118056948. The cubic root of 991442 is about 99.7139156714.

The spelling of 991442 in words is "nine hundred ninety-one thousand, four hundred forty-two".